I buy a McDouble & a Sml Fries = $2 + Tx. I time my potty stops for a McD and it works out well.
I try to avoid McDonalds as it is a bit of hit and miss with them. Sometimes clean, often not. If I am in a small town which is the county seat, I often use theirs in the Courthouse. Almost always spotless.
If not that then the city hall or other government buildings.
A cup of coffee for me...which of course sets up the next pit stop;o) A vicious circle it is!