The companies that sell storage food are experiencing huge demand and some shortages. Plant a garden IMMEDIATELY and teach others. Gather mulch. Buy fruit trees / shrubs and get them planted ASAP.
...while it is still impossible to answer the question of "How much time is left", we might be able to use the price of oil and gas as some rough indicators of where we're at. We're hovering around $125/barrel and $4/gallon right now and already seeing significant slowdowns. Shutdowns likely begin around $200/barrel and $8/gallon. At $300/barrel and $12/gallon everything stops. If prices continue to rise at a pace even roughly resembling the trajectory of the past couple of years, this gives us anywhere between 6-24 months before total shutdown."