I normally make a few portions at once since imo they have better texture anyway if you give them two+ days to absorb moisture. I try to make another portion every day, but since I have a few in the fridge it gives me breathing room if I’m feeling lazy any particular day.
No, but they are a nice addition if you like them with the added benefit of more fiber, oils, and minerals. They do help thicken everything up, so if you aren’t going to add them maybe use less milk unless you like it soupy.