It is said that anions are good for health.
Instead of using an anion generator, can I get anions by touching the negative electrode of a battery?
Unless you attach the two battery to a very fine wire with a tiny, tiny break (so that it will spark), there is not a strong enough electric field to efficiently ionize atoms. But even if there were, the resulting ions would recombine with free electrons very quickly and are not considered "anions". To have actual anions, you want a solution with equal amounts of anions and cations like NaCl water (salt water), which has Na+ and Cl- floating around.
The only way to ingest a solution with an imbalance of anions (negatively charged thingies), is if the positively charged compensator is a component of water, or "H+". This means drinking anions is drinking any acid, and your mouth will tell you, because it has an acidity detector--- sour-taste.
So to ingest anions, just drink any sour water solution. Lemon-juice, vinegar, carbolic acid, anything else that's not poisonous. It's unlikely to benefit your health, as the "positive effects of drinking acid" is probably pseudoscience traceable to the days where vitamin C was unidentified, the cause of scurvy was unknown, and it was supposed to be cured by "acidity", or drinking sour stuff. Inasmuch as the usual edible sour stuff includes lots of vitamin C, this works.
 As this answer was mainly wrong, I'll change it into more of a comment.[/edit]
I would like to know who says anions are good for your health, as I typed it into google and got a page saying how anions counteract the effects of smoking, are an anti-depressant, help you sleep better and give you a positive attitude. All of which are more than likely placebo and I would expect that any of the health benefits would be disproved in a good double blinded study.
Why go with a battery, wouldn't frictional electrostatic interactions accomplish the same? A better question would be to ask if all anions are equivalent in a biological system? The answer seems to be no (from experiment).
Biologists make up random stuff and will probably give you a sh## answer.
This may accrue a ton of -1's but I've just got to get this off my chest!
Offtopic: I am so tired of being forced to sit through bio talks that I'm gonna interrupt the next one and ask the guy WTF is this BS??? What in the MFing world is AMPQ-TGBR receptor and why the hell would you put up a Metro map with 20 billion arrows on the FIRST slide?????...and why the Fk did somebody invite a bio person to the MFing PHYSICS DEPARTMENT?!!!!!!!!!! FFS.....give me a break!!!!!!! I am going to go jump off a building right now.