New flat toilet help!

I just moved into my new student flat and my flat mates are joining me tomorrow. a bit TMI but having used the toilet today and ive realised the water system is so week our toilet barely flushes and so I can’t flush my poop 🙈 I dontknow what to do because I’ve left it and tried later but the water system is just so weak. I don’t know what to do before my flat mates get here but also what am I supposed to do for the whole year living here if I can’t poop in my own house!!