2tablespoonscitric acid, you can find this at most pharmacies or natural food stores
5quartswater
2cupssugar
2tablespoonspure lemon extract
3sliced lemons
3sliced limes
Crushed ice
Instructions
In a large pitcher or punch bowl, stir water, sugar, citric acid, and lemon extract together.
Add sliced fruit and ice.
Notes
Leftover Punch: as mentioned by commenters (and I’ve received emails about it), if you have leftover punch, remove the sliced limes and lemons before refrigerating. The limes and lemons will give the punch an overly sour acidic taste if the punch is stored overnight that way.