Here is an item that many Covenants might want, though there is a decent amount of work and expense involved.
Galin's Magnificent Fountain
This fountain was created by the Verditius mason Galin of the Roman Tribunal. He entered it in the Verdi contest and placed but did not win the contest, though many magi of arid or difficult Covenants asked for the lab text of it.
When he created this he first fashioned a large and beautiful fountain, ideal for placement in a palace, it was decorated with many different depictions of Triton and water nymphs. Before he enchanted it he then broke off 6 different sculptures and replaced them with cheap replicas. He then enchanted the entire fountain and would later enchant each of the original statues that had been broken off.
Fountain (Large, Hard Stone) 16 Pawns of Vim Vis.
From there it was enchanted to pull water from one of its statues that was tied to it as an Arcane connection. The water would disappear from around the connection on a constant basis and reappear in the top basin of the fountain, about a bucket's worth every Moment. The statue would be put into any source of freshwater, no matter how foul, within one league of the fountain. It would be advised to hide it or sink it in a deep area to make sure it doesn't get tampered with or stolen, but as it has an Arcane Connection to the fountain, it would be easy to find and recover.
Transport the Vital Fluid ReAq 58
R: AC D: S T: I
Base 25 (move water in a violent/instant way 1 league) +4 Range, +2 Duration
2 Uses per day +1, Environmental Trigger (Sun) +3.
The water fills the top basin (1 Bucket capacity) and quickly flows over it into the next basin, which can hold up to 2 bucket's worth. This second basin purifies the water in its basin and the one below it.
Dispel the Flux and Foul (PeTe with In, Aq, Co, An, He Requisites) 20
The first effect destroys any lingering foulness and foreign substances (including liquids) of the water in the basins, but does not destroy the water itself.
Base 3 (destroy dirt) R: T D: S T: G +1 Range, +2 Duration, +1 Target, +2 Requisites
2 Uses per day +1, Environmental trigger (Sun) +3
Inevitably this water too will overflow into the third and final basin where it will collect with up to 12 bucket's worth of water. There are spigots on this basin that are entirely mundane and able to turn the flow off and on to easily fill portable containers, and it is big enough (and sturdy enough) for up to three people to bathe in at once. There is one more enchantment left to make the fountain complete. Since the fountain was designed with bathing and washing in mind, the water will very likely get fouled and filthy. The enchantment of Dispel the Flux and Foul purifies it, as the enchantment affects all water in the fountain, but is triggered initially when water enters the second basin. If the water should start to overflow the bottom basin it is then teleported back to its orignal place, pure and clean. To do this the original teleportation must be repeated at one higher Target to accomodate the possibly extra water, and in this fashion can have a slight cleansing effect on the water source it comes from.
Transport the Vital Fluid (ReAq) 63
R:AC D: S T: G 2 Uses per day, Environmental Trigger
The third basin has an optional enchantment that the covenfolk greatly appreciate, the ability to heat the water. All that's needed is to push the potbelly of a mischievous imp (called Blinkin) on the fountain and the water in the third basin heats to a steamy temperature in seconds, pushing it again stops it and the water cools at the normal rate, thus water could be heated in the basin and drawn through the spigot and stay warm for a time.
Blinkin's Broth (ReAq) 19
Base 3 R: T D: C T: G +1 Range, +1 Duration, Target +1
12 uses per day +4, Item Concentrates +5
Total Enchantment levels 160
Knowing that the magi of a Covenant (himself included) would never deign to wash or even gather water as a Mundane would, he enchanted the various statues which acted as natural Arcane Connections to the fountain itself. These statues were created in keeping with the fountains decor, and all had either a pouring pitcher, a spitting face or in one case a urinating cherub which the water would flow out of.
Small Statue (Hard Stone, Medium) 12 Pawns of Vim Vis, 120 lvls of effects.
Each statue was identically enchanted to do 3 effects. The first is to draw water from the 3rd basin of the fountain they are linked to (and thus should be clean and pure). All of the effects are triggered by pushing on various protrusions on the statue and turned off by pushing them again, except for the last effect.
Propel the Gathered Water ReAq 50 (1 bucket worth per Moment)
R: AC D: C T: I +4 Range, +1 Duration
Base 15 (transport liquid 50 paces)
Item Concentrates +5, 24 uses per day +5
The statue also has the ability heat the water as it flows out.
Wizard's Bath ReAq 15
R: T D: C T: I +1 Range, +1 Duration
Base 3 (Heat water)
Item Concentrates +5, 24 Uses per day +5
Finally the statue has the ability to get rid of the water as well as the detritus left from its various uses. To trigger it the user touches the statue and simply states "Destroy the water in the ____" the blank indicates the vessel it is in (meaning it can destroy liquids that it did not conjure, even cleaning soiled chamber pots).
Clean the Soiled Basin PeAq (An, Co, He, Te requisites) 25
R: V D: M T: I +2 Range
Base 10 (destroy water and dirt)
24 uses per day +5
There are still 30 possible levels worth of effects that can be enchanted into it. The statue in Galin's own room had one last enchantment which could cook a decent stew when the water was collected in a suitable pot and filled with ingredients.
Due to the great expense in vis of the fountain and its accompanying statuary, only Galin's fountain was made in all its grandeur, other Covenants made less statues or smaller fountains to save vis, negating most of the value of the lab texts that were purchased.
If incorporated into Covenant rules, a fixture like this could easily add +1 (or more) to the living Conditions of the Covenant for both magi and Grogs, and would be invaluable in times of siege.