1.) Cut off the bottom of the soda bottle.
2.) Put trash bag through the bottle.
3.) Cut the tip so that there is a hole in the trash bag.
4.) Cut off half of the bag so that there is a bit of trash bad hanging off the bottom of the soda bottle.
5.) Take the trash bag and line the rest of the bottle.
6.) Fold back the plastic bag around the top of the bottle.
7.) Put duck tape around the bottle to hold the plastic bag in place.
8.) Take two places of string and tie the string at the base of the soda bottle.
9.) Take the tomato plant and wrap the plant in a paper towel.
10.) Bring the tomato plant through the soda bottle so that the plant is coming out to the top of the bottle.
11.) Stuff cotton balls to help with absorption. Put more soil to top of the bottle. Be sure to water the plant.