I drink somewhere about a gallon of tea a day. I typically boil about a half gallon, pour it into a gallon pitcher and plop in four bags of black tea (examples below) and let it steep for at least ten minutes. Then I pour tap water (Portland water tastes pretty good) to fill the pitcher and stir. Hot water in the winter, cold water and ice in the summer. It's a weak tea, but that way I drink it continuously all day.
But I drink a lot of teas for pleasure.
Darjeeling tea with milk and sugar is one of the great gifts of God. Don't go cheap, it's pricey, but it's better that way. Make a pot of the tea and then experiment with different levels of cream and sugar until you find the right level.
Bangladeshi tea: tons of sugar with some cream
Special cart tea: small cup of black tea with a scoop of Ovaltine and a generous dollop of condensed milk
Chai done right: boil the water with sticks of cinnamon, some cloves and pods of cardamon. After a few minutes, add the tea, take off the heat and steep. Pour over sugar and milk.
Earl Grey tea is great as a basic. I like it with cream and sugar or without.
If the burgamot is too strong, try Lady Grey, which also makes a great iced tea.
English breakfast is a good standard black tea. PG Tips and Red Rose is also good. But Yorkshire Gold is the primo stuff.
Smokey teas are awful, such as Russian Caravan or Lapsang.
I find Chamomile tea with honey to be the most soothing of the nighttime herbal teas. But there's a lot to choose from. Experiment.