Adding on to the food, a hunger/thirst system would be nice. The only consequences of being thirsty/hungry is a small speed debuff. If you are completely full, you would have a speed boost(if you don't have VIP already), and as you turn hungrier and hungrier the slower you become. Don't make the speed debuff too much though. You can buy permanent canteens that you can refill, but food is a one-time use which you can either craft/buy/trade.