What short time fix can I do until I can affford to purchace parts needed.

You might not have to buy a battery at all, if the only thing that is wrong with the car is a parasitic battery drain caused by a component that isn't shutting off (or a short, etc...) You can try to isolate the circuit that is draining the battery by pulling fuses until the drain goes away, but you would need a multimeter to know when that happens. If, as you say, it sounds like a fan is running, then find just what is running and pull the fuse for that item, then return the fuse to it's proper place to drive. Keep in mind you most likely have two fuse locations, one inside and one under the hood, and the radiator fan fuse is probably located there. Your car manual will have fuse locations and which fuse does what.

or you can simply just .. unplug the fan... the electric fan never turns on except for when it needs it. Just plug it back in before you go somewhere. And try to figure out why its going off. my guess would be a bad relay or sensor.

Those fan motors can go bad in such a way that they don't shut off. Probably needs two fans. Scan with vagcom or similar to properly diagnose.