Please write a memo to residents of the Turnkey Apartment Plaza saying there have been issues with the plumbing. Include a reminder of things not to flush down the toilets, but make them large fluffy things most people would not flush. Explain that the water in the building will be turned off all day on Tuesday so workers can clear up the pipes. Sign it from the management.
To: Turnkey Apartment Plaza Residents
From: Management
Re: Plumbing issues

This Tuesday, the water in the building will be shut off to deal with the ongoing plumbing issues. As a reminder, please do not use the toilets to dispose of inappropriate items such as the following:

Housecats
Pillows
Corgis
Overcoats
Knit caps
Ferns

Water will be off the entire day. Please make the necessary preparations. 

Thank you,
The Management