Most cat 4 races do not have feed zones. No feeding in crits and circuit races except pro-1, if that, I think. Road races may have a feed zone but only for races over x number of laps (which a cat 4 women only field may not do). If you do get a feed zone, it will be spelled out on the flyer as for location and which laps it is open. Unless you have a feeder there with you, then you'll need to figure out a way to get through it on your own anyway. Gels and chews are a pretty easy way to get quickly absorbed sugars into you in a small amount of jersey space. You can also put a spare bottle in your jersey. Discards (bottles only, not trash) can be made in a feed zone if there is one regardless of whether you take up a feed. Just go back and try to find your bottle later if no one is there with you.