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I've been doing this for over 20 years. It's easy to take to the shower with you.I make a premix in bulk-- 1 Gal Distilled Water10 teaspoons Kosher Salt4 teaspoons Baking SodaI use a NEILMED bottle that has a tube on the inside. Seeing that warm water feels better the cold, I fill the bottle with my premix and "without black top" I microwave for 10-15 sec to bring to lukewarm (test on your hand to ensure you don't burn yourself as microwaves with different wattages will heat slower or faster). Put lid on and shake a few times.
Child's Toy Light Switch Box