For camping or late nights at the beach? Leave 1/4 of Mountain dew in bottle (just dont drink it all), add a tiny bit of baking soda and 3 caps of peroxide. Put the lid on and shake - voila! Homemade glow stick (bottle) solution.
How to Make Your Water Glow (Don't Worry, It's Not Radioactive!)
DIY Glowsticks!!! First take the mountain dew bottle and pour out 3/4 of the mountain dew. Save it in a container so you can use it to make more glow. So now that the bottle only has 1/4 of mountain dew put just a little bit of baking soda (amount of the tip of a spoon). Next put 3 cap fulls of peroxide. Close the mountain dew bottle and shake well! Your mountain dew will glow!