If you are concerned about water usage then animal ag is the big thing to remove from your life.

Generally just consuming less, huge amounts of water get used making completely unnecessary shit like softdrink.

In terms of energy usage generally the vast majority of a household's energy usage is driving. So my advice?

Walk or cycle where you can, go vegan, buy less junk, and guiltlessly enjoy long hot showers outside of drought conditions.

If you like absurdly long showers look into mist showers (saves water not energy) or just water shaving shower heads.