I know this isn't the way you'd like to deal with a problem of sanctions causing loss of benefit, but I know from volunteering at a Food Bank, that benefit problems are one of the most common reasons for people needing to get help from a Food Bank. You do need to get a ticket from a refering agency, such as a Job Centre, CAB, some churches etc. The aim is to give enough food for everyone in your household for 3 days. Not a long term solution, but can make a difference. Depending on what's in the store, lower carbohydrate food items will be given, plus pet food (if you have a cat or dog), toilet rolls, toiletries etc.