Please choose the correct ending to complete the given sentence: Health: [header] How to smoke from a bong [title] Fill the bong with water. [step] Bottled or tap water will work. The exact amount of water you should pour in will vary depending on the size of the bong you're using.

Ending1: Fill up the bong so the water comes no more than 1 inch (2.54 cm) above the tip of the downstem (the long tube of glass that sticks into the bong). Any more water than that and you could get splashed while you're smoking. Ending2: [title] Insert your cigarette head and filter into the smoke chamber, on the top of the bong. [step] You'll see that the filter is on the outside of the bong. Ending3: A typical bong is approximately 22 square feet (5.9 square meters). How much water you add depends on the kind of bong you're using. Ending4: Some people prefer not to use tap water, while others rely more on keeping your bong warm and at its proper temperature. [substeps] Bottled water is considered more efficient at adding oxygen to the bong.

Answer format: ending1/ending2/ending3/ending4