A human can go for more than three weeks without food (Mahatma Gandhi survived 21 days of complete starvation), but water is a different story. At least 60% of the adult body is made of it and every living cell in the body needs it to keep functioning.
You cannot raise the rent if you and the tenant have agreed, usually in a written lease, on a certain amount. Usually, you and the tenant will agree on a certain amount for a specific period of time. Once that time period ends, you can raise your rent with 30 (thirty) days written notice. If you and the tenant never agreed on a specific period of time, you can usually raise the rent with 30 (thirty) days written notice.
If your tenant is on a month-to-month tenancy, you can raise the rent after giving the proper notice for your state, which is usually 30 days, but varies by state. Your notice needs to be in writing (letter or email), and unfortunately, any verbal agreement with your tenant usually wonât stand up in court if argued.