I use coconut for breakfast
Yogurt/pumpkin for lunch
And green beans on dinner
I use a tablespoon of braggs vinegar in his water daily.
I mean I would try it in the water first and see how it works, my little guy isn't picky about it.
I think he actually prefers the taste.
And with how big his bowls are, it mellows it out for sure, I think on the food they would get that sour yucky taste of the straight vinegar.