The spell started as a way to draw water from a remote river, where a covenant or traveller might need fresh water. I thought it would be a low level spell, however the rules for teleportation are very unforgiving. This spell could be used to fill a large reservoir repeatedly as needed, as long as the water source far away was still plentiful.
Drawing the Wholesome Draft of Poseidon
Rego Aquam 45, R: Arcane, D: Momentary, T: Part
Water is drawn from a remote locale within seven leagues to the caster who may fill whatever container or reservoir is present with the water. The use of T:Part in the design ensures that the water can be drawn from a much larger source and also that only enough to fill the container is transported.
Spell was invented by a Magus living in the remote wilderness where fresh water was scarce, so instead gathered water from far away.
(Base 4 to teleport water 5 paces, +4 to boost to seven leagues, +4 Arcane, +1 Part)
The spell Bag of Teeth (MuAq/An20, Magi of Hermes, p.12) is a better option as it is far lower level, although not as portable. If a covenant was looking to create a device to move water then a solution based upon Bag of Teeth requires a grog to walk to and fro with the teeth and adds a lot of uncertainty, but it also will cost far less vis and is far easier to create.
River Hidden in the Rocks is an item based upon the Bag of Teeth, specifically for transporting water within a sunrise/sunset. The item could have the duration extended, or the user must concentrate on the water transformation effect during the change of the sun.
River Hidden in the Rocks – MuAq/Te 20 (Base 4, +1 Touch, +1 Concentration)(+5 for 24 uses a day, +5 device maintains concentration). A small clear crystal (+5 water) set within a silver mount and necklace, which when touched to water will convert it to a smooth pebble. The pebble can then be picked up and moved easily.
Then an enchanted device for the effect above to transport water without the need for a Magus to cast spells. This too could be changed to suit the actual distance from the source of the water – hopefully downward to a more manageable level to enchant into an item (this item could reduce down to around ReAq40 but not much lower).
Draw Water from Poseidon – ReAq 50 (Base 4, +4 to boost to seven leagues, +4 Arcane, +1 Part)(+5 for 24 uses a day). This tile is made from fired clay inset with a crystal illustration of several intersecting waves, which is activated by placing an open palm upon the tile.
These spells are part of the free new spells compendium for Ars Magica.