Check a brewing supply shop, there are a ton of them online. I recommend an assortment of cork sizes and some more airlocks. The various corks will fit different sized bottle openings and allow you to use the airlocks properly.

Being able to keep the air out makes a HUGE difference.

A quick and dirty method (that works with some care) is to use juice containers with airtight screw-top lids. Cap the bottle tight, shake vigorously, and then ever so slowly crack the lid until you can barely hear gas escaping.

Close tightly and shake a couple times a day, always re-opening the lid until you can barely hear gas escape.

When you shake the container and there really isn't any gas buildup, it's pretty much done. Close it tight, put it in the fridge to crash the temp and clarify for a day or so and then rack.

lol Works when you don't have access to corks and airlocks. :D