Don’t bother with sugar. That’s mostly myth, it’s not soluble in gas. It will eventually cause issues, you cannot predict the point at which it will fail.

The cheap solution would be water and whatever you want to dissolve in it. Yes, that can be sugar, salt, etc…but the point is plain water will stop the vehicle from working immediately, necessitate dropping the fuel tank, purging the fuel system, and possibly damaging the fuel pump. You can carry water with you anywhere vs carrying bags of sugar or salt.

Plain old water.