What proportion of coffee to water should I use?
What is the "correct" coffee to water ratio to use to brew coffee?
The ratio is the same, whether you are using a French press or a drip brewer.
Use two level tablespoons of ground coffer for each 6 ounce cup of water.
If you are making mugs of coffee, their capacity is likely to be more like 8 ounces each. In this case, you'll want to use 2 or 2 1/2 level teaspoons of coffee for each mug of water you add to the brewer.
If you like your coffee strong, you can use a little more coffee. But unless you have a peculiar preference for a weak, washed-out brew, never use less.
NOTE: I explain this in detail in my video, How much ground coffee to add when making coffee in a drip brewer.