The issue of provisions may seem straightforward, too, but in fact it's worthwhile to think through the menu by days, and even better by the number of meals. Regardless of whether you travel by car or on foot, you need to stock up precisely based on the number of people. During the trip, you should think about high-calorie snacks: nuts, dried fruits and protein bars are suitable. For full meals, you should determine how much time you are willing to spend on preparing breakfast or dinner. Some hikers choose to eat only canned food, and others takes food with them in cooler bags and cook porridge and pasta on the burner.
Think about water. For hiking, you can take a small 0.5L thermos bottle, which you can easily fill and keep at hand. It is also good to have a 1.5L bottle, which will become a personal supply of water. If you go by car, you can take a few 5L bottles, for hiking in this case a folding canister will be helpful.
On a test trip or even at home, you can try to approach the traveling conditions and try to calculate how long it takes to prepare certain dishes, and what kind of food you are ready to eat on the trip for several days in a row, and which not. Make the menu in advance, this will help to calculate in detail the number of products that you need to buy for the trip.