TerriO what passes as store bought ACV is garbage full of chemicals, colorings and who actually knows, I doubt it even has apple cider in it........I wouldn't use it, as per the expensive stuff, well worth the benefits if you use it just in the waters and the ducks don't muck it up too bad that your dumping it 3 times a day............ then I would say get a new water bowl just for the ducks and leave it out. You really don't need a alot of it, I use it even in my Horses water tank a cup to 50 gallons, and a gallon last a month here............ for 3 horses water, plus 5 large chicken waters....that get a tbls. per gallon...... and a couple baby drinkers when they are younger.....1 ts per quart..... Kim
