How to entertain yourself while you're sheltering in place...

Teach your cat to play skeeball

Pretend you're a character in the Aubrey and Maturin books; this will make the monotonous diet seem more fun.

Use hoarded hand soap to make your own "slime"

Knit or crochet your own toilet paper (natural fibers only, probably avoid wool

LEGO French Revolution/Terror Homeschooling dioramas (the heads pop right off!)

Do some work or something?