I don't have bags either. If you want to try it on the cheap you don't even need bags. Here's how:

BASIC WATER EXTRACTION
Resin glands can be removed from the cannabis plant by agitating the trim in cold water â?? typically ice cold water or water that has been chilled in a fridge overnight. The trim is placed in a bucket, which is then filled with cold water. The water and trim are swirled and mixed with a wooden spoon or an electric whisk. Let the mixture sit for a few minutes before scooping out the skuff floating on the surface. The remaining liquid is strained through a coffee sieve to collect most of the trichomes, as they won't pass through with the water. Let the coffee sieve dry and you've got excellent grade trichomes extract to use to make hash (how to make hash the right way). The basic idea behind this is that cold water breaks the glands away from the marijuana leaf matter. The glands eventually sink to the bottom of the bucket because they are heavier than water. The bulk cannabis leaf matter should stay afloat and can be easily scooped away.

I bet you could tilt the bucket and use a turkey baster to suck up the resin that collects in the corner. This way your only filtering an ounce or two of water through the coffee filter instead of a gallon.