Hydroponic Lettuce Garden from Plastic Bottles (Grow Bottles) : Instructable by Professor-Mousedude This looks like a very useful instructable! It gives an inexpensive fertilizer (hydroponic liquid) recipe that I haven't seen elsewhere.
The Rain Tower Vertical Hydroponic System /* I'd love to do this as an intro to indoor hydroponics in 2014 or Grows up to 12 heads of lettuce or other small plants. */ added to the top of Troys to do list
All you need is a small amount of vertical space around a balcony or an open window which can hang or store a vertical array of drink bottles that can grow all your herbs and lettuce easily. Recycle as many of your plastic drink containers.
Growing Lettuce in an Indoor Winter Garden for Fresh Greens
Try your hand at growing lettuce indoors this winter, if you're missing your vegetable garden! If you give it what it needs, you can be successful and provide your family with tasty lettuce and baby greens that will rival those store-bought clam shells of