Help me determine the strength of my coffee I drink coffee from a Nespresso Machine (Nespresso Pixie).

I use one capsule of Ristretto Italiano (black), but run it twice under the 'Lungo' option.

Thus my question is: 
What is the strength of the cup I am getting (it'll be weaker than an espresso)? And what other brewing method can give me the same result? Moka pot? Drip coffee?
The Lungo option is a weaker setting and is still meant to be run ONCE. You run the Lungo option and use a coffee cup slightly larger than the Expresso cup. Nespresso is NOT meant to make a regular cup of coffee ever. It makes Expresso (40ml or 1.4 fluid ounces ounces) or Lungo (110ml or 3.7 fluid ounces). Also not all capsules can be used for Lungo since some are meant for weak Expressos. Get yourself a Coffee Press for regular coffee.

Another Option is make a Lungo and use Expresso to control strength of coffee. So one Lungo and 1 Express will make a medium strength small cup of coffee. Also certain brands like Bustelo capsules make very strong Expresso and Nice Lungo.