So i cleaned everything. I took the grinder apart and brushed it out. I washed the parts that are washable. I washed the coffee maker itself, and i even washed the measuring cup i use for water. I took out the old water filter. I made a pot of hot vinegar, then a pot of hot water. I put the filter back in and made some coffee. Mmmmm. So, the beans were never the problem, it was likely the resevoir. Or it was the grinder. Or it was the water filter. Or it was my cup from the other day. Regardless, it's much better now. Mmmmm.