. Cut the bottom off of the plastic bottle.
If this is a project for kids, leave this part to an adult. Slip a sock over the cut end of the bottle. If you like, you can secure it with a rubber band or ponytail holder.
Otherwise, a small sock fits just fine or you can hold the sock over the bottle manually. Squirt dishwashing liquid into a bowl or plate. Mix in a little water to thin it out a bit. Dip the sock end of the bottle into the dishwashing solution.
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Blow through the mouth of the bottle to make a bubble snake. Cool, right?. To make a rainbow, stripe the sock with food coloring. You can make any you like.
Rainbow colors are red, orange, yellow, green, blue, indigo, and violet. For most food coloring kits, this would be red, red plus yellow, yellow, green, blue, and blue plus red. Apply more coloring for a more intense rainbow or to 'recharge' the sock if you need more bubble solution. Rinse yourself with water when you're done. The food coloring will stain fingers, clothes, etc., so it's a messy project.
This is best done outdoors while wearing old clothes. You can rinse your homemade bubble wand and let it air dry if you wish to use it again.