Household:
* Milk: Whole, skim, almond, soy, oat, etc.
* Juice: Orange, apple, grapefruit, cranberry, etc.
* Water: Bottled or purified water
* Wine: (Often sold in larger quantities, like 1.5 or 3 liters)
* Cleaning supplies: Bleach, laundry detergent, dish soap, all-purpose cleaner
* Paint: (Usually sold in smaller quantities, like 1 or 5 gallons)
Food:
* Oil: Vegetable, olive, canola, etc.
* Vinegar: Apple cider, white, balsamic, etc.
* Honey
* Maple syrup
* Soy sauce
Automotive:
* Motor oil
* Coolant
* Windshield washer fluid
Other:
* Gasoline: (Sold in larger quantities, like 5 or 10 gallons)
* Diesel fuel: (Sold in larger quantities, like 5 or 10 gallons)
* Paint thinner
* Chemicals: (Used in various industries and research)
* Fertilizer: (Liquid forms are often sold by the gallon)
This is not an exhaustive list, but it provides a good overview of common liquids sold by the gallon. Remember that specific products and their available sizes vary depending on the brand, retailer, and location.