Why invest in a keurig? They are expensive to operate, with those costly little pods. I make my own cold brew coffee, which gives me total control on the type of coffee, the length I brew it, etc. That’s my breakfast treat, along with some sugar-free syrup and a bit of milk.
My daughter has a kuerig type coffee maker. She makes her own kcups by using the cup basket that comes with it, then puts the coffee in that and covering it with one of those little paper souffle cups like some fast food restaurants use for eat-in ketchup. Work great.