LauraKMisty - I would never give anyone all of my girls’ meds. In fact, all of the meds are never in one place even in my own home. Save a bottle from the last batch and split the new pills between the two bottles. Then you don’t have to panic if one of the bottles gets misplaced or spilled.
The divided pill container is a great solution to your correct dosing problem. Cut them ahead of time and label each section with the dose time. Call at dose time to remind your mother-in-law and reassure yourself.
LauraK