i ran in to this site “how to build the ultimate water gun” after seeing sony shut down the “retropod” product (sony, get real) any way, using some stuff that’s pretty easy and cheap to get a hold you too can literally make the ultimate water gun. i’m going to make one and have it ready for next summer, i’ll post pictures as i cook it up.
wish there were pictures of it in action!, maybe you could fill it with pressurised whipped cream! mmm cream.