stephen, here is what you should do with the fish bowl:
Click to reveal..
Fish Bowl with Gold Fish- Fish Bowl in 2nd Floor Bathroom. Obtain water from sink in 2nd floor bathroom or 1st floor bathtub or from garden pond by combining net with fishbowl in inventory and then click on the pond water. Obtain goldfish from water in garden pond with net. Combine goldfish with water-filled fish bowl in inventory.
And HERE is the link to the game's hints if you need them.