My friend and I both are around level 25. I am not new to the Fallout series so I have experience with managing supplies. I have a ton of food/ammo/junk that I've accumulated, but that's because I knew what I was doing. My friend however is new to the Fallout games. He barely has any ammo or aid to support himself on missions.
I remember when I first played Fallout 3. I was just like him but I adapted and now it's never a problem for me.