Step 8: Fill, hang and enjoy
I'm not going to go too deep into planting your plants in the bottle as there are a lot of resources out there. What I do is fill the bottle up half way (depending on how long the roots are. Keeping your cap on the bottle helps keep pour out and spills away at this time) then seal the bottom, but you could easily use a funnel after sealing the bottle. Insert the plant and fill to the top with more soil. Give the bottle a good watering while the plant is upright in it and get a good packing down of the soil so that when you turn it upside down it will not all spill out.Keeping you plants well watered and not allowing the soil around the neck to dry out will keep the soil from falling out until the stem of your plant is big enough to take up the neck space (at least in the case of tomatoes, whose stems get to a very large diameter).
Use your preferred methos of hanging it and ta-da! All done! I usually use what I have around, which has included wire and keyrings, or thick twine. I would prefer to use the nice chains that many retail hanging basket have, but I'm cheap and it would be like lipstick on a pig being put on cut up bottles and all.
I've thought about trying out Kryolon's Plastic Fusion line of spray paint to color them wild and fun colors, but decided I like seeing the root systems EXPLODE inside my cheap little contraption.
After you hang simply fill the resevoir with water and it will slowly soak into the soil.
Now watch it grow!