The DIY TreeGator Water Bag can be made from a 34-gallon, 45-gallon or 55-gallon garbage bag, a quick release water connector and a few PVC connector parts from Home Depot or Lowes....
1 Garden Hose Shut Off Connector Valve (~$1.50, more if you splurge for a brass one)
1 Garden Hose Quick Disconnect (~$0.44, or more if you splurge for brass one)
1 PVC Threaded reducer adapter (~$0.50)
- this is optional depending on the size of your quick disconnect and your compression adapter... this allows you to go from 3/4" pipe to 1" threaded connector, if you are lucky all your parts fit together and you won't need this... or if you decide to go to a larger pipe diameter you will need one of these to get back down to the standard garden hose
1 PVC (male) compression adapter (~$1.50 - $4.50, depending on size you select)
1 6" Garden Hose extension (male to female) (~$1.50 - $3.00)
- This is optional, only use if you want to be able to run your connection point a bit further outside the planting area or flower bed.
Garbage Bags - 34-gallon or larger in size (~$3.50 for 50 bags)
- Note: There are biodegradable garbage bags available. Some biodegradable garbage bags are for general purpose and medical use, usually taking on a bit of water will suffice and over time it breaks down into the corn based material it started at... it is susceptible to temperatures above 110F, where it starts to degrade... so, this may still be useful in the hot summer garden under mulch or in the shade.
Teflon Tape (~$0.25, get two...)
- This is used to seal the threads on each connector to prevent water leakage. You want the water to leak out of the bag, not at the connector points. They are pretty cheap - get two... Every homeowner knows you will eventually need one to fix that annoying dripping/leaking faucet.
- How to article: http://www.acmehowto.com/howto/homemaintenance/plumbing/general/teflon.php