"This is what I was trying to do, but I have such a hard time being accurate b/c I'm scared of under budgeting. The first time I did it, I overestimated by quite a bit, and ended up figuring 3000 for food

The next time I tried to be more accurate, and got 1700. So now I worry about the huge difference in my amounts I figured.
I'd rather bring more than enough, but I'm scared that no matter how much I bring will not ease my mind. This is why
DDP has always been worth it to me, just to not worry about this.