I take Apple Cider Vinegar tablets every day. They sell them in capsule form, and fast dissolving tablets. I got mine from Costco, and they’re great! But I’m sure you could find them more easily on Amazon (I don’t use this product. It was just the first one I found).
Edit: I realized I never answered your question. Sorry for that. I meant to say that I’ve taken them at every possible time of day, and I haven’t noticed anything at all. I have acid reflux issues as well, and it hasn’t bothered me. However, I only take capsules rather than a shot of the liquid form.