First, grab a clean plastic container—an old 5-gallon bucket from the hardware store works perfectly. This will hold your tap water. Then, you need a DI resin cartridge, which you can buy online for about twenty bucks. It looks like a giant tube of toothpaste filled with tiny, crazy-colored beads.
Now, attach a piece of flexible tubing to the bottom of the bucket. Use a simple aquarium pump or just let gravity do the heavy lifting by hanging the bucket high. Trust me, gravity is your friend here—it’s cheaper than a pump and you won’t be cursing at a noisy machine at 10 PM.
