A tablespoon is a non-scientific but very widely used unit of volume, which works very well in cooking, herbal medicine, etc. It is represented by a capacity of one tablespoon which varies from roughly 15 mL in the US to 20 mL in Australia.
1 If tea is properly stored, it can potentially last up to a year for green and black teas. White tea lasts about six months before it isn't as good in quality as when fresher. Stale tea (or bad tea) will taste flat, as if you're drinking paper.  Glass or ceramic containers are fine provided that they're opaque.
Remove tea bags and serve. --If using loose leaf tea: add 4 teaspoons tea leaves to a tea basket, tea ball or tea filter bag. Rest over top of jar or pitcher so the tea will be exposed to the water, but it can easily be removed after the tea has steeped. Place in the refrigerator for 6-12 hours. Remove tea leaves, and it's ready to serve. ADJUST RECIPE FOR ANY QUANTITY. Use 1 teabag or 1 teaspoon of loose leaf tea per cup of water.