I do tons of lightweight backpacking and it always amazes me the amount of day hikers (and more recently mountain bikers too) I see with zero equipment. Some don't even carry water and where I live it is usually HOT.  Often it is a young couple and sometimes even a family with small children.  It bothers me to no end and especially when people travel unprepaired with their children.  Maybe CPS should sit at the trailhead and arrest those fools.  I imagine I am likely to have to use my knowledge and gear to help one these people [again] long before I will need it to help myself.  That is if they are lucky enough to be within shouting distance of my camp or to cross me on the trail. </endRant>  
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Learn to improvise everything.