Good luck with your move to Berlin! It might interest you that there are many car-sharing schemes operational in Berlin, so that you can go completely car-less, even if you have to cover a large distance or transport something every now and then.
car2go works fine for occasional small size shuttle needs (yet their coverage is shrinking with every update of their TOS). For the ultimate exposure to Berlin-style directness (some people mislabel this as rudeness) I would also recommend renting a Sprinter van at Robben-Wientjes.
As a rule of thumb: if you stay within the S-Bahn Ring or in walking distance to any S/U-Bahn Station up to 3 stops out of it you get almost anywhere within the city in about half an hour. Biking is normally easier in the former east, since West-Berlin's post-war urban development was also all about cars.
Was in Texas multiple times for a few weeks and the car-centric AC-enabled lifestyle is always quite the culture shock for me.
You can generally have drinks delivered for little to no surcharge and probably cheaper than specifically renting a car. Plus you don’t have to carry them upstairs :)