I used to end up with water on the floor too. I started placing the body wash bottle on top of the curtain on the edge of the shower pan frame. This tend to hold the shower curtain in place against the wall. I camp solo otherwise I would go with some of the other more permanent solutions offered in previous posts.
Great choice for "Living within my means" and camping for one...
2011 Salem Cruise Lite 20RBXL & 2011 Toyota Tundra Dbl Cab
Camping History: 45 Trips / 133 Nights / 3736 Miles
FRF Social Group: Campers of the West