its a hypothetical question. nothing happened. just want to make that clear because the first response missed it.

it depends on a lot of circumstances, but generally its difficult. like when its an appartment or a single family home, and you do not know which room it may be in, you might put salt or lego stones or something else in lines across the doorways, so that you can later see if it moved from one room to another, to narrow it down.

but then you basically need to search everywhere, take stuff apart, look behind stuff, move furniture, and just search room by room.

to assist a snake that is lost but may be around somewhere, water is more important than food. they can survive months without food, but no access to water will kill them much faster.

either you find the snake soon, or it turns into a difficult problem with its individual aspects to it, and asking about the specific problem in this forum will help a lot.