Swedish and English are both spoken here. Within the city, you can get around just fine by speaking English.
Swedish Krona (SEK). It's a little bit more expensive than the U.S. dollar, but as long as you can move the decimal place over two places, you can have a rough estimate of the price of an item. For example, 100 SEK is worth about $11.61 USD.
I'm not exactly sure, since we Americans always carry a water bottle with us! The city water is very clean, so we all just refilled from the tap.
Swedish meatballs (or köttbullar in Swedish). Based on a recommendation, I went to one of the best Swedish meatball places in Stockholm, called "Meatballs for the People". I ate the meatballs with the traditional lingonberries.
I listened to a song called "Bara få va mig själv," by Laleh. My Swedish teacher introduced the artist to us, and I love her songs!