I saw #5 in "Real Simple" magazine and I've tried it, but it has never worked for me. #13- one part rubbing alcohol, two parts water, won't freeze quite solid. #15- what happens when I go around a corner? I can see this being a big fail in my car.

I really like the idea of using a muffin tin for condiments instead of 3 or 4 little bowls. Will have to try that. Thank you for these, Catty1!