An inflatable paddling pool and a few tubs of chamois butter would do the trick, and it's portable.
I would also class it as meaningful architecture.
I have a box of crystals that will gel the water.
Can I come?
To be honest, I was expecting you to supply the paddling pool.
Can you get hold of some of that expanding foam stuff too?
@Smallfurry started
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An inflatable paddling pool and a few tubs of chamois butter would do the trick, and it's portable.
I would also class it as meaningful architecture.