A Recipe to Completely Hide the ACV Taste?

I don't know if I am writing this in the correct place but I would really love my 2 boys to take it but they HATE the taste of Apple Cider Vinegar and get suspicious when I give them something different as they know I am trying to get them to have it. I have tried to disguise it a couple of ways but have run out of ideas. I don't like giving them soft drink on a regular basis or cordial. Any ideas would be appreciated. Has anyone got any ideas on how to get it into children's tummys?