How many iodine tablets should be added to a 2-quart canteen of clean water for purification?

When it comes to purifying water using iodine tablets, the standard guideline suggests using one tablet per quart of water for adequate disinfection. Since a 2-quart canteen contains double the volume of water, the appropriate number of iodine tablets to achieve effective purification would be two tablets. This method ensures that the water is treated sufficiently to eliminate pathogens and make it safe for consumption.

For longer-term storage or varying water conditions, one might consider different practices, but the basic recommendation remains consistent that two tablets for a 2-quart canteen provide an effective level of disinfection.