Teapot when home, but let's concentrate on mugs on building sites.
One teabag in mug, pour fresh boiled water slowly in the mug trying to hit the teabag.
Leave for 3 minutes occasionally lifting and dipping the teabag so to move things around (if it's a cold day cover the mug with a brick or a piece of wood)
Add sugar, if wanted, and stir properly.
Add milk, just enough to have a tanned tea ready for you to enjoy.
I always liked making tea for everyone, it gives a break to work your boll@x off and I love the smell when hot water hits the teabag.
Nobody ever complained of my tea; in fact, I usually get compliments.