Why is everyone always so opposed to real coffee? J/k. I know, it's heavy and bulky, and not really essential to hunt or survive.
I have camped and made coffee with a GSI French press and with a Melitta plastic pour-over cone. Both are great methods. I prefer the pour over for the ease of cleaning and light weight.
Via packets may be better than most instant, but still don't hold a candle to real coffee. Me and my buddy decided that we will sacrifice weight and comfort in enough other areas that it will be worth packing along real coffee. It's the one comfort item we plan on bringing and something we both really enjoy.
With that said, from a purely practical standpoint, I guess Via packets are best. Despite their politics, I would probably get the Via packs for my week of hunting, and boycott them the rest of the year.