I love these lights! They are pretty in expensive, so you could fill you a hot tub, pond, or pool fairly easily (or stick with the bathtub like the manufacturer suggests). I found them at a variety of UK sites but not in the US….but they should work as they are battery powered. See prezzybox or google ‘spa lights’. Maybe you want to tie them all together with fishing line or have a pool cleaning net handy so you don’t necessarily have to get wet to turn out the lights.

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Tivoli Gardens Inpsired Lighting