Pour the water and fiber into a large microwave-safe bowl.
Microwave your slime on high power for 2 minutes.
Stir the slime with a spoon. Not a whisk, trust me on this. Return it to the microwave and heat it for another 2 - 3 minutes.
Stir the slime and check its consistency. If you want your slime a little denser, microwave the slime another minute or two.
Continue checking your slime and microwaving it until you achieve the consistency you like. The more you cook it, the thicker it’ll be
Caution – This gets HOT! Molten lava hot. This is not a project for unsupervised kiddies.
Add a drop of food coloring and/or some glow paint, if desired. Remember not to let the kiddies eat the slime if you use glow paint. You'll get an interesting effect if you don’t completely mix the coloring into the slime, such as multicolored slime or slime with glowing streaks.
Store your slime in a sealed baggie in the refrigerator to prevent dehydration.
The slime will last as long as you keep it from drying out, but please note this is an edible food product and will eventually mold.