I'm going to subtly and cheekily change the obvious advice. There are three ways to deal with negative cashflow, not two:
- Decrease your expenditure
- Increase your income
- Change your accounting system
You're currently studying for a degree. You don't say what country you're in or how your studies are funded, but most people in the US, UK, and a fair number of other countries, run up debts while studying for a degree. They do this because a degree is valuable to them. They can't avoid it because the tuition alone costs more than most students can generate in income, never mind their living expenses.
So by all means look for savings, (1). Clearly strangers on the internet can't just think up ways for you to spend less money without knowing anything about what you do spend money on. But you can at least list your expenditures for yourself, and see what's necessary. Consider also how much fun you want your studies to be: 4 years in a cold house to avoid paying for heating, and never going out with friends to avoid spending on unnecessary stuff is all very well. But with hindsight you'll regret torturing yourself if you're ever well-off enough to pay back whatever you would have borrowed to use for heating and fun.
Only do (2) if it doesn't affect your studies or if the money you're paid justifies delaying the valuable asset you seek to acquire (a degree, leading perhaps to a better job but at least to the capacity to do a full-time job rather than fitting work around your studies). There are some jobs that are really good fits for students (reasonably low hours that don't clash with classes) and some jobs that are terrible.
If these fail, resort to (3). I don't mean dishonest book-keeping, I mean accept that you are going to borrow money in order to pay for something of value that you can account as an asset. Work out now what you'll need to borrow and how you think you can pay it back, make sure the sum is worth it, budget for that, stick to your budget. You'll still have negative cashflow, nothing changes there, but your capital account looks fine.
Personally I wouldn't actually put a monetary value on the degree, I'm not that bothered about the accounts and it's really difficult to be accurate about it. You can just consider it, "more than I expect to borrow" and be done with it.
Studying costs money. Once you've graduated, you probably aren't going to be back here saying, "I want to buy a house but I have no capital and I don't want to go into debt". Are you? ;-)
Although if you are, the answer happens to be "Islamic mortgage"! I don't know whether Islamic banks have an equivalent answer for student debt, since they can't own a share of your degree like they can a share of your home. Unless you're a Muslim, presumably the ways that Islamic finance avoids interest payments would not in any case satisfy your desire to be "not in debt".