First purchase regular table salt (33 cents at Walmart). Color the sand using food coloring - the liquid drops work best. We tried with the gel first since I had more colors but the gel sticks together and doesn't color as well. I used frosting containers for shaking and then later for storing.
Spread the colored salt on a baking sheet and bake at 250 for about 5-10 minutes to dry the salt.
Then use to fill bottles or in our case make cards:
Next we're off to find some glass or plastic bottles for filling!