By taking shorter showers and not flushing the toilet
Stop drinking for a couple of weeks and see if the flushing stops. If you can't stop drinking for that long, you have a much bigger problem than the flushing.
because the entire point of the overflow resovoir is to overflow, and release uneeded water
It will be exaclty the same, the only difference is that flushing the toilet with bottled water is very expense. It really will be a waste of money.
Each flush of a toilet uses the same amount of water.
You could have a venting issue with your venting system, or a blockage with your main line. Your toilets dump alot of water all at once. Try to visualize all that water hitting a closed bubble of air in the pipes--that is why they could all be flushing oddly.
when your engine is hot it causes the water to boil and the water and the anti freeze will come out of the overflow pipe.
What exactly is overflowing? this can range from a blocked toilet to a faulty washer
Overflow can measure the volume of an object that is fully submerged.
adjust the floating bulb, it may be running over the top of the overflow pipe
The bath filler waste is directly connected to the trap and overflow water is supposed to drain there -it is not a leak.
Of course UNLESS you bought a model that is self flushing then NO... as it is the design to waste thousands of gallons of water a month