How many iodine tablets to use per gallon of water?

For water purification using iodine tablets, typically one tablet is sufficient for one quart (about 0.95 liters) of water. To purify a gallon (about 3.8 liters) of water, you would use four iodine tablets. It's essential to follow the specific instructions on the tablet packaging, as concentrations may vary by brand. Always allow the water to sit for at least 30 minutes after treatment before consumption.