We don't have a dishwasher and don't use a clothes dryer. Both are costly in energy use.
We keep the heat at about 64 degrees and wear warm clothing indoors in winter months. We use an electric blanket on very cold nights rather than heat the whole house. We also moved into the smallest bedroom in the house because it heats up and cools down quickly. We tracked and planned airflow in the house for summer months rather than use air conditioning. We draw air from the basement to the attic, not just the living spaces of the house. So far we haven't needed to install a whole house fan, but we seriously considered it and would again if necessary. We also caulked shut many windows that we don't use and it cut winter drafts significantly.
We do have water jugs frozen in the chest freezer to protect against prolonged power outages, and it not only is a good way to store water but also does keep the temperature in the freezer very low.
Regarding reducing water flow in the toilet, our plumber told us that our older toilet required all the water in the tank to flush properly. There was no pressure other than gravity to enable flushing and the house's sewer pipes would clog if we put bricks or a jug of water in the tank, especially for any toilet that is far from the sewer discharge.