This app was mentioned in 3 comments, with an average of 1.00 upvote
There was an Android app called Drinkly that gives a notification every 2 hours to drink water. It doesn't offer a lot of customization, but could be something worth checking out. I know you said food, not water, but taking a few bites of something every 2 hours might be easier than full meals?
That's weird. I guess there's a problem with Google Play, so searching for it manually shouldn't help much. The name is Drinkly though. Here's the full link again: https://play.google.com/store/apps/details?id=com.matejhacin.stayhydrated