Inserting Full Bottle
I didn't think to pull out the base to show you, but it is just one of the bottles I used to use for my window farm. I cut off the top of a standard 5-gallon water bottle (I drilled a 1-inch hole near the top, then used tin snips, finishing the edge with some 1/4-inch tubing sliced so it could fit over the raw edge of the plastic). Since I need water to flow in and out of the base, I drilled additional 1-inch holes near the bottom. If you drill too fast, the plastic can rip (why would I know this...).
Here's a picture showing what the 5-gallon bottle looks like with the lid snipped off (I originally did this to create a fish tank for my aquaponics window farm system):