My husband says we have all but one part necessary to build a normal drip system but because he is an incredible procrastinator and we're low on cash I decided to see what I could find online.
I started here, of course. My favorite is "IcePop Drip Irrigation" by marcintosh but because I am container gardening, I don't have quite the room necessary in each container to lay a bottle down. Others that I saw would require creating some kind of hanging bottle system which I wanted to avoid as I want my little garden to look as natural as possible and you just can't get that with plastic bottles dangling around.
My inspiration for this instructable came from Gayla Sanders at You Grow Girl. Mine is different only in that I put a different number of holes in my lids and used various sizes of bottles based on the size of the planter they'll be used in. Oh, and I didn't use a serrated knife to cut the bottoms from my bottles because I figured that scissors would work more quickly and easily.
What you will need:
(List based on making one waterer. Multiply appropriately for however many you need.)
20 ounce plastic bottle with lid (soda, or juice washed out, if it was water, no need of course.)
Sharp paring knife
1/16" drill bit
Solid surface on which to do your drilling
So gather your supplies and click ahead to the first step.
(Picture with the finished product nestled amongst the greenery of one of my plants coming soon.)
Step 1: Stabby Stabby Snip Snip (Or: Preparing the Bottles)
First, put on your safety goggles. No, they're not as sexy as a pirate eye-patch, but you want a drip system, not a hospital bill, right? Right!
On your firm surface (mine is an old Formica covered drawer front on the kitchen table) firmly hold the bottle in one hand and set the tip of the knife at a straight up and down angle, near the end of the bottle. Quickly and firmly stab the bottle to avoid the bottle crumpling under the pressure of a slow stab. Do NOT rear back Psycho style shrieking, "SKREE! SKREE! SKREE!" When you do this. You'll only freak out your neighbors and probably end up stabbing yourself. We're still trying to avoid that hospital visit.
After the hole has been made with the knife, work the bottom blade of your shears into the hole and cut your way around until the bottom is off.
Step 2: Ooooo.... Power Tooools... (Or: Preparing the Lids)
Put the lid, opening side down as shown in the picture, on your work surface. Drill straight down, but don't push too hard or you'll whip right through the plastic and start drilling into your work surface. The weight of your drill will probably be enough to make the hole.
I experimented a bit with how many holes to use. I started with 3 and put it in a pot of soil. It drained out in less than five minutes. One hole may work but I'm starting with two to see how I like it. If the bottles are empty in an hour, I'll clog a hole with Mighty Putty or something.
Step 3: Ta DAAAAA! (Or: Finishing Up)
Make sure there aren't bits of plastic clogging the holes.
Screw the lid back onto the bottle.
Dig a small hole that is as as big around as the bottle and the same depth as the length of the bottle from the top of the cap to where it widens to it's widest.
Put the bottle into the hole, and fill the bottle with water.
How long it takes the bottle to empty will be based on how many holes you put in the lid, how much sun the plant gets, whether or not rain can get into the bottle, and how moist your soil is.
I suggest that you check it a few times a day until you know what to expect then water as needed. You can even add liquid fertilizer once every couple of weeks and it will go straight to the roots.
Don't throw these away in the fall! Simply rinse them off and store them for use next year.
I'm sure that smaller bottles can be used for indoor plants or smaller outdoor plants, and two and three liter bottles could easily be used for large containers or even trees. Give it a shot and let me know how it works for you!
(Photography credits go mostly to my spawn. I did the rest myself.)
You're not still wearing those safety glasses are you? Whatever for, silly?