Your mastery of water magic beckons at your command.
Prerequisite(s): Ability to cast 4th-level spells, Elemental Focus (Water).
As long as you have an elemental (water) spell of 4th level or higher in your known spells and have at least 4 MP in your MP pool, you may control water at-will using half your caster level. When you cast control water (whether at will or using MP to cast it), you may even sculpt the water into any shape you desire, although it is still water. While you could make a pillar of water to raise yourself given a sufficient amount, making a water ladder is probably not a good idea. As a secondary benefit, you gain a +1 competence bonus to your caster level when casting elemental (water) spells.