This is directions for Army tea, as told to me by a WW1 Veteran (Canadian Army) when i was a kid. They made this in the trenches, and often this was all they had for sustenance, except for a bit of bacon grease (often rancid) and moldy bread pieces. Often they would not have sugar, which the lack of makes the tea pure hell and nastiness...... 
Its strong enough to dye wood with, strong enough to make you mad and want to kill, strong enough to erase ANY pangs of hunger you might have, and trust me it keeps you going. Makes yer teeth look British.
Its full of tannic acids
(for several cups) :
take a large Billy can and fill with up with water (1.5 liters) . Add 1/2 cup loose tea leaves (earl grey or orange peko or PX issue). Add 1 cup sugar. Boil, stir, boil, stir, boil, stir for abotu 30 minutes. Let it steam off. Add 3/4 cup bacon fat or stick of butter. Stir well , dissolve and let boil slightly. Stir and pour into canteen cups. Drink.
Most times i omit the butter or bacon fat but a bunch of times i have added them in and its actually quite tasty.

Its strong enough to dye wood with, strong enough to make you mad and want to kill, strong enough to erase ANY pangs of hunger you might have, and trust me it keeps you going. Makes yer teeth look British.

(for several cups) :
take a large Billy can and fill with up with water (1.5 liters) . Add 1/2 cup loose tea leaves (earl grey or orange peko or PX issue). Add 1 cup sugar. Boil, stir, boil, stir, boil, stir for abotu 30 minutes. Let it steam off. Add 3/4 cup bacon fat or stick of butter. Stir well , dissolve and let boil slightly. Stir and pour into canteen cups. Drink.
Most times i omit the butter or bacon fat but a bunch of times i have added them in and its actually quite tasty.