19 month old iron supplement

My son has had a heart murmur since he was a newborn, he got an echo done and there was nothing wrong. He still has it, and his pediatrician recommended trying an iron supplement, because it sounds like a flow problem.

My problem is, I got the iron drops, which I knew would be gross but I didn’t think I would have this much trouble with it. I would have to give him a cup of chocolate milk 8 times a day to get it down. It only works if I put 1–2 drops in a big glass of milk, mixed with Nesquik. Needless to say, I don’t want to do that. Lol I don’t mind giving him chocolate milk once a day, but if I try to give him the whole dose in 1 or even 2 sittings, he’ll take one drink and not touch it ever again. You can smell the iron, I don’t blame him 🤢

Any suggestions?? I’ve tried everything. Only thing I can get to work is only putting in 2 drops at a time 😭