You can create a water guardian.

Once per day as a standard action, you can pour the contents of a full waterskin on the ground and summon forth a water elemental on that spot. The creature remains and follows your commands for 1 minute. The size of the elemental is based on your character level, as given in the table below.

Character Level 1st-5th 6th-10th 11th-15th 16th-20th
Water Elemental Summoned Small Medium Large Huge

You can select this feat multiple times, gaining one additional daily use each time you take it. If you have faith, you gain one additional daily use of this feat for each daily uses of faith you expend.