It depends on how bad your leak is.
If it's a small leak you can just keep an eye on it and add as needed. Make a few stops along the way.
If it's more serious then I recommend towing it.
Keep in mind, if you run out of fluid while driving it'll make the repair a lot lot more expensive $$$.
[Edited by vinamg on 04-09-2001 at 11:01 AM]