In Ireland, there are two official languages: English and Irish (Gaeilge). Although English is more widely spoken, both languages are present throughout the country, such as on street signs! It is mandatory for students to take Irish language lessons in school as an effort by the government to help preserve the language. There are regions in Ireland, known as Gaeltacht areas, where Irish is spoken as the primary language. The Aran Islands are an examples of a Gaeltacht area.
In Ireland, the euro (€) is the national currency for banknotes and coins. Interestingly, you will not find a €1 or €2 bill in Ireland! Instead, these values will be found on coins; the smallest bill is the €5 bill. If you were looking to exchange $1, you would receive €0.92!
In Ireland, you can expect to pay between €1 - 1.50 for a bottle of water, depending on the brand of water. In the grocery store, a bottle of water is referred to as "still water" because it does not have carbonation.