Coolant Ratio?

Hi guys. So I installed my CAI last weekend and like a tool I guess I nudged the radiator cap a bit during the install. Anyway I'm driving down the road revelling in my recent success when coolant starts spitting out from under my hood. My entire engine comparment is covered in coolant and now I get the reminder of my hastiness everytime I get in my truck via the wonderful yet persistant smell of fluid.

Anyway sorry to ramble on, I re-filled my radiator with distilled water until I can drain it and re-fill it again this weekend. Is the mixture for the 08 simply 50/50?

Thanks in advance.