1 cup of seaweed powder (More or less depending on preference)
2-3 tablespoons water
A few drops essential oil(s)
1 drop food coloring, plus more if desired
Special equipment: plastic pipette, large or small round bath-ball molds (or you can use plastic Easter eggs), storage jars
Stir together Epsom salts and water in a mixing bowl. Using pipette, add oil, 1 drop at a time, until strength of scent is to your liking. Add food coloring, 1 drop at a time, until desired shade is achieved; stir until color is even throughout.
Spoon a generous amount of mixture (more than necessary) into 1/2 of a bath-ball mold. Pack firmly. Repeat, packing mixture into second half of mold. Press pieces together until they connect. Remove top half of mold very carefully. Let bath ball stand, mold side down, overnight (set ball on an overturned jar lid to keep it from tipping over). (If you don't have a mold, you can use an ice mold tray or plastic Easter eggs.)
Remove mold carefully. Invert, and let ball dry completely, 2 to 3 days more. Transfer to jars.If they fall apart or crumble too easily, they’re likely not being packed hard enough in the molds. It could also be that there’s not enough water.