Hi there all physics geniuses. I come looking for help. I need to create water pressure in a vessel in the easiest possible way. And not by using a standard manual pump to pump in air. I've come up with a syringe-spring type system but it's flawed as the spring will rust... Also I've thought of forcing water into a chamber through a one way valve using a piston similar to that of a syringe. Does anyone have any other ideas? Thanks!