The 22-year-old was found unresponsive in a bathtub on January 31 and her father Bobby has remained on constant vigil at her bedside.
Speaking at his first public appearance since Bobbi Kristina was hospitalised, he said: "I must tell you all, this feels really, really good. I want to thank you all for coming tonight and supporting me and my family. Rough times are rough times, and hard times are hard times. I don't know what the hell I'm going through right now but I'm giving it to God and letting him deal with it."
An insider had previously claimed that the 46-year-old star believes his daughter can be saved, and that he is "still leaning on the power of prayer".
Bobbi Kristina was recently moved to DeKalb Medical, a long-term acute care facility in the area, and Bobby is convinced his daughter will regain consciousness again.
Meanwhile, Bobbi Kristina's maternal grandmother Cissy Houston recently admitted she is praying for a miracle.
"She's the same. We've moved her to a place for rehabilitation. And you know, still not a great deal of hope. (We're) still praying.
"I give it to God one time, because I know he's able. And I cannot change a thing. I'm asking everybody: 'Just pray to the Lord who we know can do something about it.' If he works a miracle, thank God. If it happens the other way, I'm alright," she said.