for the life of me I can't make a decent cup of coffee. First I thought it was the coffee, so I made sure to buy a good-quality brand. Granted, I do not have a grinder at home (I am young, and still am setting up house)I buy coffee in smaller quantities and grind it at the store. Then I assumed it was the apparatus, so I switched from a drip coffee maker to a french press. Still, bitter and stale tasting coffee. So now I am assuming its the water. HELP!-do I use spring, distilled, filtered...what?