Alum from a grocery store, as simple as that. Thanks for the info. There's a store near me that sells lots of canning supplies, so I'll look there for Alum.
The PUR Reliance product sounds good, too. I might have to take a couple different products and have a water "bake-off"!
Sport Cases (Electronics)
Reflective Hull Decals
Touring Kayak Paddles
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