Recently, having found myself on a tight budget (aka "supporting myself") I learned a very important thing.
You don't need half of the crap you think you need.
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One of the best ways to make money is to find ways to stop spending it.
Here are some examples of things you can do if you get really strapped:
1. Use the Internet via your laptop's Wi-Fi at an Internet Cafe or similar Hotspot, or schedule a block of time during the week when you plan to use a library's computer, rather than paying a monthy access fee. Also consider using NetZero free dial-up, or the cheapest ISP available, if those are not options.
2. Ditch your landline, and your cellphone plan if you're paying very much, switch to prepaid phone cards (or the cheapest voice plan your provider offers). Keep all conversations short and business-like, under 5-10 minutes, absolutely NO long conversations. Save extended communications for snail mail, e-mail, or in-person. If you find yourself having to wait on hold, use the phone at a friend's house for that rather than wasting your minutes.
3. Stick to cheap foods like rice, peanut butter, oatmeal, homemade bread, and jelly. Drink only filtered water, or tap water if you feel bold. You can eat very cheaply if you just refuse to waste money.
4. Don't feel like you need to populate your home with decorations and furniture. All you need is a chair, a bed, an alarm clock, a trash can, pans/silverware, a table, and a lamp at most. That's it. You only need the cheapest ones, and can even use makeshift versions.
5. Sell or throw away anything you can't find an immediate use for. Don't waste time and money toting around things you don't need. If possible, convert all your paper documents that you're not legally required to hold the original of into electronic form via scanning, create several backups, then recycle the paper. You'll save a lot of space that way.
6. Don't buy name-brand clothing, and don't buy anything flashier or more expensive than you need to look presentable.
7. You don't need a home washing machine and dryer, there's always the laundromat, or just a sink/washbasin and clothesline.
8. Same goes for dishes, you don't need a washing machine, you can wash them in the sink with dish soap, sponges, and steel wool.
9. If you live in an area with a reasonable mass-transit system, or usable bike paths that get you where you're going, you don't need a car. You may need one, though. If you do need one, make sure you have a fuel-efficient compact car, preferably made by Toyota or Honda, particularly a Corolla or Civic, because these reduce fuel costs and are cheap/easy to maintain.
10. Live with a roommate (or several) if possible, in order to cut your share of the rent. It means you may have to compromise on some of these policies if your roommate is spoiled to convienence, but it also means they'll pay for some of the cost to balance it out. Privacy is not cheap, so if you can learn to do without it, then do so. If you aren't in a position to get a roommate, then make sure to rent the smallest space available, and don't pay extra for a nice place. All it really needs to be is a place to store stuff and sleep safely, you can spend the rest of your day in libraries, walking around, at a gym, or in other places.
11. Don't use your A/C or Heat if you can help it. Tolerate discomfort, only turn them on if you're going to be in medical danger otherwise. Even then, only turn them up/down to the temperature you need to be safe, not comfortable. They create huge electric bills.
Well, those are my tips on saving money for anyone who wants them. Good luck!
