If emptying tanks and running taps, try not to create an aerosol (a fine mist) of water or spray, where you empty it.
I.e. running off water through the showerhead would be a bad idea!

If there is a risk of spray, wearing a simple dust mask can mitigate against the small risk of infection from legionella and any other bacteria in the system.
If you have a boiler, it's worth having it serviced and safety checked before you use it.
And any tanks you drain can be disinfected and cleaned.