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fish made from recycled soda bottles. WAY I WOULD DO IT: cut liter bottle in half and staple shut with rounded cardboard inside. Cover rough edges with duct tape before giving to students. and then covering with scales, glitter, tissue paper and paper mache
Homemade Sprinkler. Cool the kids off with a homemade sprinkler. Take a 2 liter soda bottle, poke holes in it. Attach to a garden hose via a male to male adapter that cost less than $5 at Lowes. Toss over a tree branch and let hang. You can adjust how the water sprinkles by adjusting the water flow. Who comes up with these brilliant ideas?
Ok, so these are on sale on Etsy for anywhere from $15-$45. Ridiculous! But super duper easy to make. I made my own from scrap fabric costing me ... $0!!!!! It is great to have and I love it (so a 5 for that) but it also got a 5 because of the price!