Very easy method for good coffee with an okay grinder: use a Hario switch or similar immersion brewer. Very forgiving. Heat water to roughly 200f and add water first in a 16:1 ratio. Add beans on top and let sit however long. Maybe like 5+ minutes. If the coffee is astringent grind corser. If it seems weak either up the ratio to 1:15 or 1:14 or grind finer. Very easy, repeatable, good, almost as quick as a drip.

Water is very important to a cup of coffee. It is mostly water. I would suggest you make your own or use a brand of bottled water.