Get two 2liter bottles, some aquarium air hose and a T-connector (Aquarium stuff from Wal-mart). Optional is an aquarium gang-valve for individual hoses to feed each plant. fill each bottle with water 2/3 full. Add sugar- 2 cups shake until well dissolved. Add yeast 1/2tbs. Take two liter caps and drill holes just big enough to fit aquarium hose. You want the hose to stay right at the cap, dont stick it down into the bottle or you might end up showering your plant with a nasty mix. take the hose from the 2 liters and join them with a T connector. attach T connector to gang valve. Run hoses from gang valve to each plant. Two bottles will last appros 2 1/2 -3 weeks. Take care not to put too much yeast in, it will probably bubble and go up your hose.
This is a basic setup, I use 1 two liter bottle per plant and keep the hose from the gang valve approx 2 in above plant tops.