As we know, water is essential for life more than food, and will always be something that we have to take any outdoor activity of some physical intensity or duration. Water is not only necessary for drinking, but can also be useful (for example) to clean a wound by applying first aid. Therefore always be taken into account, and know for sure where in the road is water (whether natural or artificial sources), and in any case bring water reserve in case, if only to have along the route to any incident.
The food is less necessary, especially during take less than a day (especially if we ate well before you leave). But it all depends, of course, our level of training and practice, because maybe there can be a person who has no problem with not eating for 5 hours, others at the slightest physical effort they whet the appetite.