Keeping track of everything you spend can be a challenge. If you are interested in not only tracking your fixed expenses but variable ones as well, your bank may already be doing this for you.
If you online bank and use your debit card a lot many online banks are now offering free software that will show you what you spend and what percentage of you money it takes up.
For example, if you buy groceries at two or three particular stores, the software can be told to use those stores and numbers to figure out what you spend on food. It will provide you with handy graphs and make your budgeting much easier.