- Keep it in a bucket of water?
- Keep it in the shade
And STOP USING PLASTIC! Use metal or glass, the plastic leeches into the water and slowly dopes you with phytoestrogenic esters called Phthalates.
The lead he's going to need to keep it from floating will probably be worse than the plastic.
A 20lb weight attached to the bottom should do the trick. s/
Air is the better insulator. Water is good at keeping things the temperature of the water. Which is going to be hot, since the plastic bucket would be in the sun.
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