I read some studies a while back that showed taking a bromelain (pineapple enzyme) supplement on an empty stomach consistently each day will eventually reduce floaters fairly significantly by dissolving them.

EDIT: According the study linked below, roughly 200mg of bromelain taken 3 times per day, and done for 3 months, should give the best results. Most bromelain supplements on the market seem to start at 500mg, so I suppose just one per day should be okay, though it may take longer since it’s not spaced out to keep the dose more constant throughout the day. There is bromelain powder which you could dose out to 200mg, but this stuff has a very strong odor that may be difficult to swallow in a liquid.

Also, don’t take bromelain if you are allergic to Pineapple.