Things I will not do this month:
Buy two tanks of gas. (Hopefully I won't have to fill up at all.)
Buy new wiper blades.
Buy a new space heater.
Ride the T.
Go to a museum.
Buy plane tickets.
Make more than the minimum payments on my student loans. (I consolidated a few of them last month, so my minimum payments are a lot lower this month, anyway.)
Hopefully, these measures will mean that I won't spend more than I earn this month. (Of course, in the next few months, I still have to make a hotel reservation, buy another set of plane tickets, put down a security deposit on a new apartment, and pay for memberships in a couple of professional associations. So, we'll see.)