'Someone told me about the loose leaf tea and being able to make several cups from the one brewing.'
Unlike tea bags, loose tea leaves can be used repeatedly for 3-30 times depending on the tea types. The teas made of young leave and unfermented (green teas) or lightly fermented (white teas) can be used up to 3-4 times, while the teas made of more mature leaves and more fermented (oolong teas and black teas) and be used for 5 times or more. The longest lasting tea leaves are Pu-erh teas, made of leaves from tea trees instead bushes, fermented post production for a long time, some premium tea leaves can be used up to 30 times.
Rule of thumb: keep topping up with hot water until the flavour is not more.