I agree carrying spare filter is a good idea. Knowing how to change them is even better. If you don't know how to change them learn.
There are lots of mechanic that can change the filters for you if you get a bad load of fuel but they may not have the correct filter with them. Having the correct spare filters with you could get you going faster. Also knowing the correct filter number will help when you make the call to the mechanic so he can ensure that he has the filters when he arrives.