How much water to add to a 80 lb concrete bag?

For an 80 lb bag of concrete mix, you typically need to add about 3 to 4 quarts of water, or approximately 2.8 to 3.8 liters. It's essential to follow the manufacturer's instructions on the bag for the best results, as moisture requirements can vary based on the specific mix and environmental conditions. Start with the lower amount of water, and adjust as needed to achieve the desired consistency.