The answer is: It depends on the size of your container. If your measuring cup or bottle is a standard 8-ounce measuring cup, then 1 liter is about 33.814 US fluid ounces (that’s 1,000 milliliters).
However, if you’re using a quart-sized measuring cup that holds 24 ounces of water (960 milliliters), 1 liter would equal 34 U.S. fluid ounces (1,000 milliliters).