Spare filters are in the utility closet off of the back bathroom.
The filter is on the wall of the foyer below the thermostat.
The circuit panel is on the wall next to the front door: switch off the desired circuit breaker(s).
W wall of kitchen (incl refrigerator) & outlet to R of kitchen sink SW corner of LR
N wall of kitchen, incl disposal, & NW outlet of LR right of range
front bathroom back bathroom
The main valve is beneath the back bathroom sink, the handle on the right:
gently rotate the handle upward 90 degrees to vertical (perpendicular to the water pipe) to close;
gently rotate the handle downward to horizontal (parallel to the water pipe) to open.
Front bedroom: the switch controls the top receptacle of the outlet of the wall opposite the door
Back bedroom: the switch controls the top receptacle of the outlet of the wall with the window
The hot and cold are reversed: turning the knob counterclockwise makes it colder, and clockwise makes it hotter.