Maybe keeps sticky notes and a pen by the enclosure and just put up a note with the date for the last time you attempted to feed? (Or write down the next soonest date to attempt to feed) that way you know on sight by whichever method if it is time to feed again or not.
I use Google sheets to track all my snake info, but it is a bit more effort than the sticky note to set up.
Sent from my SM-G950U using Tapatalk