If the water got in it shows that the patch isn't stuck properly to the skin. As the hormones are contained in the adhesive you won't be getting the full amount of absorption. It is not advised to get the patches to stay on by using tape as, again, the hormones won't be properly absorbed. I found the thigh quite difficult to get a taut, smooth patch. It sort of wrinkled up in the middle. I stick mine top of the buttock. Hope the next one sticks better.
Taz x