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Are you aware you can buy these polyacrylamide crystals by themselves, in any garden center, without having the mess of removing them from a diaper? Look for them marketed as "Miracle Gro Water Storing Crystals."
Also, in lieu of the shower curtain, you could use "Food Saver" heat seal rolls and cut them to size and seal them easily and quickly with the little machine that comes with it. Or there is a little electric device, Euro-sealer, that reseals any plastic bag, with a heated wire underneath a fiber-glass cover.