- 1). Fill an empty 2 liter Coke bottle one-third with water.
- 2). Add in 5 drops of food coloring, any color your prefer, and mix well. Screw the top onto the soda bottle.
- 3). Lay a wood board onto a table top, and place the soda bottle lengthwise against the board.
- 4). Tape the bottle onto the board with clear packing tape.
- 5). Hold the soda bottle level horizontally against a store-bought level. Find the balance point, and draw a line down the bottle to mark the water line when the bottle is level. When you hold the bottle against something, you can make the water line match the drawn line to make it level.
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