48... Bd1 49. Kg5 Bc2 50. Kf6 Kc7 (intending b8, a7, a6) is another try for Black, but too slow.

this position is a draw, but I can see how Black screwed it up

Bd5 is Black's losing blunder, Kc6 is the only move that holds the draw.

This is definitely a blunder by White, turning a won game into a drawn game. The winning move was f5. The horrible blunder Kf6??? leaves e4 undefended against how Black could've held the draw after next move.

This is a draw because Black has Be4!! which stops Kg7, and there's no way for White to make progress. If White pushes a pawn, then the bishop can easily stops both pawns' promotion since the pawns will be in a diagonal structure, Black's next move gives up the chance to draw and then White is winning after that. Even if White hadn't played f5 here, the game is still a draw since there isn't any other way for White to progress. White's only chance to progress was getting the king to g7, but now that doesn't work because once Black's bishop gets to e4, the king will be tied down to defending the pawn, and attacking the bishop gets White nowhere since the bishop simply moves along that diagonal and is ready to stop the pawns if they advance.