Alum - 1 teaspoon of alum to 8oz of water. Dissolve the alum in a bowl with a wooden spoon before pouring it into the spray bottle. I use warm water to dissolve the crystals.
Carrageenan -- 1 tablespoon of carrageenan to 8 cups of water. Use a blender to mix. Gently fold the carrageenan into the blender. Mix for 30 seconds.