Find water
From Ardrana
The find water spell enables the caster to find any water source within a certain distance while also allowing him to estimate how plentiful the water is. Powerful casters also have a chance to know whether the water is drinkable. Water can be found through rock, metal, or any other material.
Note: This spell originally appeared in this form in Arabian Adventures (for priests) and Dragon Magazine 120 (for wizards) for the AD&D game from TSR. Its use here is for the purposes of providing context for the campaign only.