This is what you will need...
5 Quarts of water
1 TB Citric Acid (You can get this at your family Pharmacy)
1 TB Lemon Extract
3 Cups Sugar (Or Splenda)
When I am making this for a large group of people, like a ward party of a family BBQ I tripple the recipe in a Gott container. For the Water I use 3 gallons and then add a bag of ice. By using that amount I have found as the ice melts it will not get tasting watered down. This is such a hit with both kids and adults. Tastes great and is so refreshing at a backyard BBQ on a hot summer day.