I want to start drinking tea more instead of coffee, I really like matcha tea but whenever I’ve had it it was with milk, but I want to drink more water and want to know if I can mix water and matcha tea?
Also I have a cold brew coffee maker, could I put the powder in the filter as I submerge it? How long would it last in the fridge (assuming I can)?
Matcha is traditionally made with water. Using milk, like in a matcha latte, is a newer trend. Look up a traditional match recipe using a whisk. Note, I know that most people do this with ceremonial grade matcha, but I’m not sure if people do this with lower grade matcha (for example, the bag you might buy at Costco). It sounds like you are probably not using ceremonial grade, so I can’t vouch for how good it will taste. However it’s still worth experimenting with.
“Cold brew” matcha doesn’t really make sense. The goal of cold brew is to extract flavor from coffee/tea leaves over a long period of time using room temp/cold water. However matcha isn’t really meant to be extracted, it’s meant to be suspended in a liquid and drunk. If you want a “cold matcha drink” rather than specifically cold brew, I would try just throwing some matcha with some cold water in a mason jar, pop the lid on, and shake it up. Then just drink immediately.