I use a little bit different approach to remind me to eat. First of all I’ve always got 100cal of Tailwind in each bottle (one per hour). Then I have my Wahoo auto lap every 30mins to remind me to eat something from my food stash shooting for another 100-150cals per hour.
I’ve tried and had success with an all liquid diet (Tailwind, Maurten, homemade, etc.) but find that I tire of it after about 4 hours. Now that I’m trending towards ultra distance stuff for next year (multiple 10-15 hour days in a row) that’s not going to be sustainable going forwards. Hence moving more towards real food with a bit of Tailwind mixed in for electrolytes and a baseline of 100cals per hour.