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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. 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. When you're filling the bong with water, pour the water directly into the mouthpiece (the open part at the top of the bong). Use your fingers, a pair of scissors, or a grinder. Make sure it's ground up finely. Break off a couple of larger pieces, about 0.5 cm (0.2 inches) long and wide, to pack at the bottom of the bong bowl. If you're using a grinder, take the lid off and place 2 or 3 buds of cannabis in between the grinder's teeth. Close the lid and twist the lid back and forth to grind up the cannabis inside. The bowl is the funnel-shaped piece that sits in the outside portion of the downstem. Take the large pieces of cannabis you set aside and pack them in the bowl first; these pieces will prevent the finely ground cannabis from getting sucked through the bowl as you're smoking. Then, pinch some of the ground cannabis between your fingers and drop it into the bowl. Don't pack the cannabis too tightly or air won't be able to pass through it. If the cannabis looks pressed down or compacted in the bowl, use something small and thin like a paper clip to stir it up and loosen it. If you're smoking alone, don't pack the bowl more than half full. You can always pack more later. If you're smoking with friends, pack the bowl so the cannabis comes up to the rim of the bowl. Don't pack it any higher or some could fall out as you're smoking.
Fill the bong with water. Grind up your cannabis. Pack the cannabis in the bong bowl.