This is actually the first time I've tried them. You can just get activated charcoal tablets at a health food store or healthy grocery store (I got mine at Market of Choice, which is sort of like Whole Foods). I don't know about tummy pumping but they're used for drug overdoses a lot because they soak up the toxins in your stomach and intestines and make them harmless so that your body can just rid them normally. I did a little research online that said that sometimes drinking it in powder form mixed with water can cause v* but only in a small percentage of people, and it didn't say anything about that being a side effect with the pills, and I took 2 of the recommended doses (2 pills) about an hour apart so if it was going to cause that it definitely would have already.
I always drink apple cider vinegar though, it's a really good anti-n* and a home remedy for practically everything. Also if you're around someone who has an sv and you take apple cider vinegar the acid in the vinegar will kill the virus and prevent you from catching it! Apple cider vinegar has given me more freedom and confidence as an emetophobic than anything else. It's my miracle cure!