Food and drinks is one of the big areas where people tend to spend a lot of extra money; while groceries are a necessary expense, of course, a lot of people spend far more than they need to on food, as they go out to eat on a regular basis, grab fast food for lunch and even breakfast, and pay for expensive specialty drinks every day from their favorite coffee shop; if you want to cut back on spending, this is the first place you should look, realizing that a small sacrifice here can free up a lot of money for other things that you will enjoy quite a bit more down the road.
Impulse buying on items they do not really need is another problem a lot of people have; while discipline is the central component of keeping yourself from purchasing such items, the best way to accommodate this discipline is to have a 48 hour rule - saying that any time you see something you think you want, you will wait 48 hours before making a decision to buy that item!
And if there is a specific something that you would like to have more spending money for, this can aid you in your quest to not spend money on all the little things that have a tendency to deplete your budget. As little things pop up and try to get you to spend your money, keep this bigger item - the bigger picture - in mind, and this will assist you in maintaining discipline toward that item you will be a lot happier to have!