Put the tea leaves in a pitcher and add water. The ratio is one tablespoon of tea leaves to four cups of water.
Place the tea leaves in the fridge overnight. Herbal teas, like hibiscus, peppermint, or berry teas, brew the slowest, while green tea and black tea can take only three to five hours. Leaving any kind of tea in the fridge for 12 hours is fine, but going over the 24-hour mark could leave your tea tasting too strong or leave a have funny taste. Remove the tea from the fridge.
Pour the tea directly from the pitcher into a glass with an inverse strainer sitting in it.
Remove the strainer, and dispose of the tea leaves.
Pour your cold brew loose-leaf tea into a glass, add ice and any sweeteners you want, and enjoy!