DIY water bottle toys?

[clothmama]

@sim mentioned when she was here some cool things that you can do with small water bottles but cant' remember what she said to do (I think glitter was involved?). Anyone have these or can give me some ideas, I have bought a 6 pack of small matching bottles to be going on with!

@clothmama

Water, baby oil, food colouring and glitter of different shapes and sizes!

Like this