The food bill rarely jumps because of one big purchase. It climbs because of small habits that stop being small once two people eat from the same shelves on different schedules. The fix starts with knowing which habits are doing the damage.
Local option: New Plan Care gives families in the St. Louis area in-home help so a parent can stay home: companionship, help with bathing and dressing, meals, and overnight care. Call (314) 405-0887.
Name the drivers
Look for these in your own receipts: meals cooked for two schedules instead of one, produce that goes soft before anyone eats it, specialty items bought for texture or a diet need, bulk packs that outlast their use, convenience foods bought on tired evenings, and delivery fees that stack on top of the order. Each of these pushes the total up, and each one has a different fix.
Run a two-week receipt log
Write down what you bought, where, and whether it was eaten, shared, or thrown out. Separate the items your parent needs from the items the whole house uses. After two weeks, the waste column will tell you more than any budget app. Do not trust a memory of the bill. Trust the paper.
Compare pickup against delivery
Check the delivery fee, the minimum order, the substitution policy, and the time window. Pickup often costs less but needs a car and a person with the time to go. Delivery can save a trip but may add fees that make bulk shopping a better choice. Compare one week of each, using the same list.
Check diet needs before you swap anything
If your parent has a diet that was ordered by a clinician, ask that clinician or the care team before substituting items, even when the cheaper version looks similar. A lower-cost food is not always a safe equivalent for a medically ordered diet, and the decision belongs with the people who know the full picture.
Look for food help with eligibility rules
Public food assistance programs in many areas use household rules, and living arrangements can change who counts. If your parent might qualify, read the eligibility page for your state and count the household the way the rules define it, not the way you live. Do not assume you qualify or that you do not. Check the rules, then apply if they fit. For local programs that can help you sort this out, see Local Help for Caregivers in St. Louis.
Set a shared list
Keep one list on the fridge or on your phone that both households use. Mark staples, the parent's own items, and the items that expire quickly. Shop from the list, not from the aisles. A shared list does more to hold the bill steady than any single coupon.