Food at my house is about 4800 a year. Divide that by .04. The answer is 120,000. That is the amount that I need in my nest egg to supply food for 30 years. Inflation is counted in because your nest egg should grow at the rate of inflation (unless we get another oil embargo and inflation flies through the roof like it did under Carter).
The second largest thing we need to save for? Property taxes and insurance. I figure in ten years we will need to move from this land so we can afford property taxes. Arizona has some of the lowest property taxes- who knew!