It really depends on how often you cook outdoors - every meal, for example, or twice a week - and if you are using a dutch oven in addition to grilling directly over a flame.
The dutch oven can bake bread, cook rice and casseroles. It doesn’t require much in the way of charcoal or briquets, but daily use will take a chunk out of your energy supply.
I’m considering buying a small griller that uses sticks as a fuel source. I want to heat water in the morning for coffee and do not want to use either of my two set-ups which cook large amounst and require a considerably larger fuel load than an old camp kettle for heating water.