One would simply add such an herb to hot water and let it melt. A good example of this is E Jiao. Soaked Herbs that are very aromatic or volatile can be decocted by placing them in hot water without cooking on the fire. Just boil some water, take it off the fire, and let the herb steep. Hong Hua is an example of an herb in this category.
Some herbs come in powdered form.
With these herbs, you simply add the appropriate amount to hot water, stir, and drink. Some herbs that are especially expensive are powdered to make more efficient use of their properties with the minimum cost. Generally, as a rule, it is best to take your herb tea one hour before eating, on an empty stomach. This provides the best absorption of the ingredients of the herbs. If the herbs cause a little stomach upset, drink the herb tea one hour after eating, or d rink some fresh ginger juice before taking the formula, or eat some fresh ginger before the formula.