I personally have a one weeks worth supply of food for a single person in a 5 gallon bucket with a few extra items such as soap mouthwash toothpaste and comfort items like cigars. Ive actually attempted to last a week on minimal supplies doing no high calorie work and it was fairly easy. My supplies can easily be cut in half to last two weeks with no high calorie work and while not comfortable Its better then nothing.

Any longer then 1-2 weeks and I think A food supply is gonna be the least of the worries. Moving on and locating more food would be a best option by then in my opinion. This theory of mine is mainly based on current income and size constraints as well. If I could afford more money aside and more space for another 2 buckets I would prolly do so.