The is a 1 gallon water bottle bpa free with straw. How many bottles of water are 1 gallon? If you get one, you will know how big is a 1 gallon water bottle. The water botle is made from Tritan/PETG material. The water bottle is resistant to high temperature (0℃~85℃). When it is filled with hot water, it will not release BPA. It has passed the FDA certification of the US Food and Drug Administration.