Food? Maybe not.
But I think clean water for drinking and cooking will be much harder to come by. For several generations most Westerners have grown up with water from either a mains water supply or from bottled mineral/spring water. Once the supply stops, many people won't know where to look to replenish their supply.
Once the mains water supply stops due to lack of personnel, damaged infrastructure, lack of power etc. etc., most city folk are going to stress about where to get more.
While digging a well is (relatively) easy enough, most city folk don't know the first thing about where to dig a well or how to do even rudimentary cleaning of water other than boiling it. Now boiling is going to take care of a lot of the nasties in water but most individuals will never be able to clean large quantities in a short period of time, certainly not enough to keep a small community going at anything more than a subsistence level or water production.
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