I want to start drinking tea more instead of coffee

Not sure if you are aware of it, but matcha has pretty high caffeine content. It’s less than in coffee, but more than in other types of tea. One gram of matcha powder contains approximately 20-45mg of caffeine. So, if you prepare a cup of matcha using 2 grams of matcha powder, you could get up to 90 mg of caffeine. Tea leaves being naturally grown things, it’s impossible to know how much caffeine is in each tea leaf.

In case you want to reduce your caffeine intake even more, you might want to try other Japanese green teas. As you like matcha, your taste buds might agree with other Japanese green teas as well.

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)?

One tea brewing method you might want to look into is grandpa style tea brewing. To grandpa style brew tea, you simply put some tea leaves into some kind of container, such as mug or water bottle, and add some water. As you drink the tea throughout the day, you just add more water over the leaves as needed, basically keeping the leaves submerged in water the whole day. Some teas are better suited for grandpa style brewing than others. Japanese tea leaves are usually broken leaves, and broken leaves quickly turns the tea liquor bitter/astringent and as such might not be suited for grandpa style brewing.

There are couple tea communities that might be helpful in your tea journey:

• !tea@possumpat.io
• !tea@lemmy.zip