All you need is coffee, ground for a french press, a container to steep it in, and a container to filter it in.
The ratio is 1 part coffee to 2 parts water, so I usually use 3 cups coffee to 6 cups water. Make sense?
Find yourself a good-sized glass pitcher (I use the yellow one in the picture) and mix up your coffee and water and let sit for a good 12 hours. I usually put saran wrap on the top to keep bugs out since my pitcher has no cover. After at least 12 hours, you are ready to strain. Really, you can probably use a drip coffee maker and filter for this, but I don't have one, so I use my Chemex. I put a paper filter in the Chemex and stir up the grounds/coffee in the pitcher and pour it through. Now, it's thick stuff, and generally I fill up the filter, then let it filter itself while I walk away and do something else for a while- it takes a bit. I often go through 2 paper filters per batch, and this does involved scooping some of the coffee grounds out of the filter to pour more in.
it's not as complicated as I just made it sound. But this is why you could use a regular old drip coffee maker with pot & and a strong paper filter- pour your coffee & grounds into the filter and let it drip through into the pot.
Anyway, once you've filtered all your coffee, you have coffee concentrate. Chill, and serve by mixing 1/3 cup coffee concentrate with 2/3 cup water, serve with yummy soy creamer over ice and enjoy!