1) cut open a glow stick and pour all the liquid into a container. I’m going to try a plastic 1 liter bottle.
2) add glitter. Amount needed depends on the size of your container. Start small and add more until it’s right
3) seal the container
4) shake well
5) watch your kids squeal with happiness!
EDIT: Some reviews recommend using glow in the dark fabric paint to drop into water instead and omitting the glitter. Let me know which works for you!
*This should be a supervised activity. While most glow sticks are non toxic, ingesting them is not a good idea.