I usually put things like that in with some dark towels - dark towels that have been washed numerous times and don’t bleed anymore. Recently I got a hot pink dress and my husband put it in with a load that included some of his undershirts. Whoops. I’m not sure why you’d put hot pink in with white... Even the color catcher didn’t help with that.
i remember my mom having a washing machine where you could save the water to re-use. When we got our first washer I asked for the water saver one, but they said they didn’t make that kind anymore.