4. Some say you should budget your food as well.
This is a hard thing to do. Particularly hard for a foodie like me. Having restraints on food is really hard for me but not going overboard is important. Have a budget set for each meal. This will also vary, of course. An average meal in Europe will be more expensive than South East Asia. One way of keeping a tab on your food is to look for accommodation that offers a complimentary breakfast.