For more control on what you eat and drink, you will need a stove. For some types of trip off the beaten track you will need a stove. Make sure you can obtain the fuel for the stove you choose in the countries you are visiting. The most versatile stoves are multi-fuel. Remember, you won't be allowed to fly with your fuel bottle full. As a back up, a simple Esbit stove which runs on solid fuel tablets takes up very little space and ensures you can boil water or make a simple meal wherever you are.