What do I do with them

Hint 1 of 6:

Did you read the plaque in THE SOURCE room on the left?

Hint 2 of 6:

Did you come into THE TWINS with a goblet?

Hint 3 of 6:

Does the goblet have water in it from THE SOURCE room?

Hint 4 of 6:

OPEN a snake and EMPTY the goblet in snake's mouth.