A: To make less than a gallon, simply reduce each ingredient by the correct ratio. For example, in a half gallon brew you would need 1/2 cup of sugar and 1.5-2 TBSP loose leaf tea.
Your culture/starter tea is not meant for brewing more than 1 gallon. If you'd like to brew larger quantities, we would recommend brewing a 1 gallon batch first. Let this first brew go for a least 12 - 15 days so the starter tea gets strong enough, and the culture grows large enough, to be able to brew a 2 gallon batch on the next go round. Then use both the new culture as well as the original culture for your 2 gallon brew.
After your first batch, just double the recipe for two gallons! So you'll need both your cultures, 2 cups of liquid starter tea, 2 cups of sugar, and 6-8 TBSP loose leaf tea.