The clever silicone head of this wine bottle filters and strains your tea as you pour, giving you iced tea that is worthy of presentation straight from your fridge door. Cold water is the best way to brew iced tea, as no bitter tannins are released from the tea plant – leaving only a clean pure crisp infusion of tea. How to make your favourite tea tonic cold brew tea: 1). Please two heaped teaspoons of your favourite tea tonic loose leaf tea into the glass bottle. 2). Fill the glass bottle with tap or cold water up to the top measurement marking on the bottle. 3). Check the filter is secure in the removable bottle spout, then press the bottle spout firmly on the top of the glass to seal.