My Daughter is depressed since the death of her friend on NYE. She assumes it was HIS fault for Drowning?

I don't see what you want answered. The boy has drowned no soul searching or analyzing is going to bring him back. Even really strong swimmers can drown. Maybe he got caught in rubbish under the water and struggled to get out of it. Unfortunately you cannot trust news reports and the only way you would know the truth is if you were there personally. Remember boring stories don't sell papers. You can beat yourself up over the whys and wherefores and what ifs but it will not bring him back It is terribly sad that a life has been lost here but you need to focus on the good in this person, and not constantly think about how he met his demise. Your daughter could probably benefit from some counseling on ways to deal with this, obviously it is a traumatic event in her life but while she may never "get over it" she needs to be able to deal with it and move on in the future. Good Luck