Gosh, no. I make a tea from ACV myself when I have a cold. It's just vinegar, after all, not a medication. You can leave it in till they drink it all or they mess it up and you have to refill it. Just don't put it in a metal waterer.
It is still a great preventative and source of vitamins and minerals, so go ahead. No matter what type of ACV I use, my customers rave over the taste of my eggs when I am consistent in it's use. I agree with them...it seems to lessen the strong sulfur smell and taste and leave a pure, clarified tasting egg behind.
The mother is a gelatinous glob in unpastuerized vinegar that contains the fungus spores that develop when apple juice is allowed to ferment. It contains beneficial microorgasms that can help improve a digestive system, boosts the immune system and increases the occurence of vitamins, minerals, etc. in your ACV. You can also piece it out to other jugs of apple juice to get your own vinegar growing a nice culture of the same.