Name the recipe and the reserved amount
A label should let someone decide whether they can use any of the item. “Two tortillas for Thursday tacos; others available” works better than “don't touch.” If the item stays in its original storage location, add a small note without covering identifying information that another person might need.
Tie the reservation to an actual plan
Reservations should expire when the meal changes. If Thursday's dinner moves or is canceled, remove the note and tell the person who does most of the cooking. An old reservation is an easy way to keep everyone from using an item nobody needs anymore.
Give the reserved meal a date and an owner. “Pat's Wednesday salad” tells the night cook whom to ask before changing it. If an unexpected guest needs the ingredients earlier, the household can decide whether to release them, change the planned meal, or replace them before Wednesday.
Release the reservation after a change
When the meal is canceled, remove both the physical note and any reminder elsewhere. If a new dish uses the same ingredient, write its new purpose rather than leaving a stale label. Review old reservations before shopping; an item that looks unavailable may simply be sitting behind a meal that nobody intends to cook.