There is information out there, but probably the best way to find out is to actually try it. Grab a small Bluetooth or Wifi device and seal it in a waterproof enclosure or bag, and submerge it to the bottom of the fish bowl under water. See what happens. This should provide more valuable insights than the simple theoretical RF attenuation of water per meter, since in the fish bowl you have an irregular geometry and also the device will have a short path for RF out the bottom of the bowl.
Some references that might be useful as well:
A forum thread reported that Bluetooth under water doesn't work.
A white paper from Laird Technologies says, "The 5 GHz wave form is attenuated by common building materials to a greater degree than the 2.4 GHz wave form. On the other hand, the 2.4 GHz wave
form is optimally absorbed by water." (Optimizing Operation at 5 GHz, p. 4)