Any one of those little gadgets SRS linked to will do the job....
Any 'department store' should have an assortment. I have metal ones, plastic ones, and mesh ones....I use the plastic one more often, as they have a finer mesh to allow ONLY flavor thru)

I was a tea drinker for 50 years, and almost NEVER used tea bags. I put about a level teaspoon of loose tea per cup into a tea ball, (or whatever) and pour water that has JUST come to a boil over it, then stir it about a bit, and wait 'about' 3½ minutes. Tastes differ. (different teas may need more or less steeping, according to YOUR taste).