your workout is under an hour: make sure you keep drinking that water and continue to listen to your body.
if you want to go more than an hour you should try eating 25 to 30 grams of carbohydrate every half hour (i.e. from sports bars, fruits or whole grains).
your body not only needs to refuel but it also needs to rebuild with some protein since intense exercise involves the breakdown of muscle tissue.
some possible snacks are: peanut butter and banana sandwich on whole wheat toast, cottage cheese mixed with fruit, scrambled eggs with whole wheat toast.
the most important thing is to pay attention to your body and feel what works 