Question: how much coffee do you need to make 30 cups of coffee?
Answer: Setup the percolator. Put 2 cups of coffee in the jar of a 30-cup percolating urn. Fill out the loaf together with 24 cups of water to get a ratio of 1 to 2 tbsp of coffee to each 6 ounces of water. Always never reuse coffee grounds, and begin with fresh coffee.