English has been the main language spoken in Scotland for the past few centuries, although there is still a small percentage of the population who can speak Scottish Gaelic. There is a government effort to encourage more young people to learn Scottish Gaelic, and you can often find road signs, building signs, and national policies written in both languages.
Scotland uses GBP (British Pound Sterling), which is represented by this symbol: £.
In Scotland, you can use Bank of England bills and coins, which still have the face of Queen Elizabeth on them. There are also Scottish banknotes (bills) that are absolutely beautiful. They often have colorful images of landscapes, animals, and historical Scottish figures on the front and back. You can use Bank of England bills in Scotland, but you cannot use Bank of Scotland notes in England.
I don't buy bottled water in Scotland because we have some of the world's best tap water! But if you head down to England, where the water doesn't taste as good, you can buy bottled water for as little as £1 in a grocery store. Of course, you'll pay more if you're buying from a gas station, restaurant, or cafe.