In Tomb Raider anniversary at the croft manor you get the bow from the water but then lets say you drowned and now the bow is neither in your inventory or in the water where is it?

In Tomb Raider: Anniversary, if you drown after retrieving the bow from the water in Croft Manor, the bow will typically reappear in its original location. The game resets the item to its original spawn point, allowing you to collect it again. Simply return to the water area where you initially found the bow to retrieve it once more.