I like my tea strong and unsweetened, restaurants have weak tea. I drink about 3 quarts of tea every day as well as water and occasional 'zero type' soft drink. I heat water in a quart canning jar, 3 1/2 minutes in microwave, then 4-6 individual cup tea bags, steeped 5 minutes or longer. I drink this as hot tea, or pour into drinking glass with ice for iced tea. In the same jar I'll use a gallon tea bag and 2-3 individual cup tea bags(or 8-10 individual bags) for 1/2 gallon of tea adding water and ice to fill 1/2 gallon jug. I like all the various flavors, herbal teas, and I mix them. I might drink caffeinated first half of day and decaf 2nd half. I like all the Celestial Seasonings teas, Rooibos, Oolong, green/white, and English/Irish teas. Do not squeeze black tea bags if you want to limit that bitterness taste. You can squeeze all others.
Unsweetened tea takes a little getting used to, and I do enjoy sweet tea sometimes when eating out. Waitress once told me unsweetened tea was like drinking muddied water, and Rooibos, Oolong, and Pau d'Arco teas are a little on the woody/earthy side of flavor.
When I come in from hunting (sitting on the side of a cold tree in Winter) a quart of strong hot tea is really nice.