Here's a way to make cheap and easy epsom salt crystals in only hours. It's a fun way to observe science and engage in learning at the same time. The materials only cost about a dollar, making this a quick, clean, inexpensive, and simple. (That is if you don't already have them)
Step 1: What You Need
The only ingredients in making this experiment are 1/4 cup of epsom salt, a 1/4 cup of hot water, a fork, food coloring, a beaker or a bowl, and a refrigerator. These are easily obtainable objects that can be purchased almost anywhere.