What I used: 3 tbsp. Epsom salt (or coarse sea salt) 1/2 cup baking soda 1/4 cup cornstarch or arrowroot powder 1/4 cup citric acid 1 tbsp coconut oil spraying bottle with witch hazel or water liquid food coloring essential oils (optional)
We made these last summer and they are super fun. Really, a blast. Within minutes our yard was packed with every kid in our neighborhood for an almighty splash down that lasted over an hour. Fun times.