Okay. Now I know it's broken.

With 0 lbs of food and no other supplies you'll last 0 days.
Add the sewing kit only and you'll last 3 days?
Just a pet makes it 5
Just vitamins makes it 10?
With 0 lbs of food and all the other supplies (except the couch, pets and vitamins...no food) you'll last 37 days....maybe but only if you're lucky.