Re: Big ant problem, don't know what to do
If I had a feeder that was 100% beeproof I would mix sugar water, peanut butter and frontline for the ants. Someone was doing it for yellow jackets - only using tunafish and frontline. (in a cat/dog proof feeder trap) It is of course VERY poisonous to bees, small children, dogs and cats.
For the moment I am counting my lucky stars. My water bins under the old stand have screening over to keep most of the bees out, and are large enough to keep most of the ants out as long as I don't let any weeds grow up next to the pallet platform and make a bridge.
Bees in winter - new phenomenon, but I've got them... So far so good.