Preface: At no point during this update was Summer running the counter, so you could only buy food from the vending machine and not healing items. I don't know about other people, but I usually end up using 1-2 bandages per fight. There were probably other examples of Summer being missing, but this update was probably the most noticeable as you were supposed to prepare to leave on this big mission, but you were unable to check/supply yourself with the appropriate supplies. Janet's KCal doesn't fill fast enough to reliably rely on her for healing in every battle, so bandages are the go to healing item.
Suggestion: Have a way to either purchase Bandages (or other items other than food) from the vending machine, or a way to access Summer's shop when she isn't available.