Parents and leaders will sometimes incur troop related expenses.
The procedure depends on the type of expense. But generally, a receipt is submitted to the treasurer for reimbursements.
The limit on spending is 6 dollars per scout per meal. Typically, there are 4 meals per scout per campout. For details on monthly campout meals see here. So, for a patrol 5 that would mean $120 budget for the Grubmaster. The parent submits the grocery receipt to the troop treasurer. They should cross out items used for family consumption vs. patrol consumption on the campout and subtract the amount from the total. This avoids having to go through the cashier twice for a combined family/troop grocery run. The treasurer credits the family’s account.
If the adult is driving more than just their scouts to the campout or if they are pulling the trailer, they can be reimbursed for costs. The reimbursement is 30 cents / mile if pulling the trailer and 15 cents / mile if scouts only. Any tolls will be added as accrued.
All other expenses that are not explicitly budgeted need prior approval from the troop committee. In these cases, the receipt should also be copied to either the scoutmaster or troop committee chair in addition to the treasurer.