#SharingABathroom with your roommate can be difficult. Apartment Therapy has some tips for how to handle sharing an #apartment bathroom so you don't have to fight over doing your business.
First of all, communicate with your roommate about when you need to get in the bathroom. Don't wait until they're taking a shower you deem "too long" and get angry because you're going to be late because you just need to put in your contacts or use the facilities and leave.
Schedule your use of the bathroom. If you're fortunate enough that one of you can use the bathroom at night and the other in the morning, then perfect! Otherwise, you need to discuss how you will both have time to get ready.
Some housekeeping tips: always clean the drain after you take a shower and change the toilet paper roll if it's empty.
Buy more if you're out, don't always wait for your roommie to do it. Also, schedule a weekly cleaning where you both always pitch in and help. Be aware that if have a higher standard for what is clean, you'll probably be doing more work. Accept it and move on.
Let your roommate know if you have a special situation where you have to take your shower at a different time than usual or need more time to get ready for something special like a job interview or date.
Put your stuff away when you're done using it, but go easy on your roommate if they are in a hurry and don't put away their blowdryer. If it happens often, go ahead and have a discussion, but wait until you've calmed down and can be rational.
Be sure you've got something fragrancy, like matches, a candle or air freshner, for those situations where a smell diffuser is called for.