Lastly, I will add it is really convenient that so many countries in Europe use the Euro because it means I don't have to exchange money as often while I'm traveling! Interestingly, in Ireland they round cash transactions to the nearest 5 cents. In other countries however they use 1 and 2 cent coins as well. One and 2 euro coins are common everywhere though.
First, what kind of water? Sparkling (carbonated) or still ("regular"/what U.S. is used to)? Both varieties are very common here. I have been in some countries in Europe where sparkling water is actually more common. I wouldn't say that's the case in Ireland, because I've noticed both kinds being used about equally.
A personal sized bottle of still water is about €1.20, give or take €0.10. So around $1.30 in U.S. dollars. Do you think sparkling water costs more or less than that? (Trick question! It's usually about the same).
The best meal was a brunch potluck with foods from all over the world. My university (Dublin City University - DCU) is a "University of Sanctuary" which means DCU has made a "commitment to welcome asylum seekers and refugees into the university community and to foster a culture of inclusion for all".
This week we are bringing awareness about this fact and have various events going on. One was this brunch. We encouraged people from all different backgrounds to attend and to bring whatever dish they wanted. The invitation was extended not only to people from the university but also to nearby refugees and asylum seekers (people who have applied and are hoping to be legally considered refugees soon).