Sadly I’m in Canada so the rodi buddy is expensive (120-140$) I’ll eventually get one but for now I’m just gonna switch to premade rodiRO Buddie for $70. Have been using one for a year now. Still running 0 TDS and DI is only half depleted. I have a 13.5 Evo and keep a 20 gallon Brute of fresh water on hand.
Look around for used RODI as well. I picked up a 5 stage locally for $45, need to buy media for it before I set it up.