How many ounces are in a gallon? 128! I’m drinking approximately 3 gallons of water daily to keep my constipation under control but everyone is different. – “The” trainer @62!
CAN’T DO THIS IN A GYM! How many ounces are in a gallon? There are 128 US fluid ounces in a US gallon. If you're in the UK, you'll find a gallon measures 160 UK fluid…
