What are things the things people purchase by the gallon?

People commonly purchase several items by the gallon, including beverages such as water, milk, and juice. In addition to drinks, household products like cleaning supplies, paint, and motor oil are frequently bought in gallon quantities. Some consumers also buy food items like sauces or cooking oils in bulk to save money or reduce packaging waste. Lastly, gardening supplies like fertilizers and pesticides are often sold by the gallon for larger-scale use.