This bag of citric acid. I've already talked about this in another post but this stuff changed my life, no hyperbole. It's used for

Making bath bombs,as a dishwasher booster(no more water spots!), water heater cleaner, canning and so much more. I initially bought a 5 lb bag, and have since moved onto a 10lb one so that should tell you something lol.

https://www.amazon.com/gp/product/B0B9XZMX8L/

https://www.amazon.com/Milliard-5lbs-Baking-Sodium-Bicarbonate/dp/B0774M73SF/

https://www.amazon.com/Milliard-Citric-Acid-Pound-VERIFIED/dp/B00EYFKM32/

$80 for the system, then $40 for supplies

use distilled water or RODI water for the reaction, it will react better.

also use 250g of baking soda to 200g of citric acid (mfg says 200:200 but that's sub optimal reaction)