yeah you can as long as you keep working the muscle it will. When you have worked the muscle it rips inside the protien builds and repairs the muscle. having protien powder or supplements just makes the process a little easyier and faster.

it is possible, it will just take longer to see results and it will be a lot harder to accomplish

You most certainly can build muscle without protein powder or other supplements. Protein powder is actually somewhat useless considering your average protein shake has 20 g of protein and you can get double that from a tuna sandwich. There are plenty of supplements worth taking out there most of which contain creatine. A lot of people hate on creatine talking about how dangerous it is, but as long as you drink enough water daily there are no serious risks. I hadn't taken any supplements my whole life until last year and I added about 65 pounds to my bench press in 2 months using a couple different types of creatine. If nothing else, getting a good supplement will get you in the gym regularly and you'll get results regardless of what you take. Bodybuilding.com is a great place to get supplements at a reduced rate if you're interested. Good Luck