In this heat, iced tea is a go-to drink, but the method almost always starts with boiling water, which sounds like the ...

How much to drink: Tea is primarily made from water, so it contributes to hydration levels, but it should supplement, not replace, water intake. For most people, 2 to 4 cups of unsweetened tea per day ...

Ruiz swears by ice brewing (also known as kouridashi-style brewing), a Japanese method of frigid cold water extraction. With this technique, the tea brews as a big block of ice melts.

For example, Pure Leaf Honey Green Iced Tea carries this claim and has 25 grams of sugar per 18.5-ounce bottle (from sugar and honey), as well as stevia extract.

Tania Stacey (right) and Kym Cooper's love of green tea has led to the cold-brew tea company. (Supplied: East Forged)"I was recently in South Korea, which has a big drinking culture similar to ...