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I have a 200o honda civic LX... manual transmission
When I shift into first, there's a watery gurggle sound... almost like an aquarium bubbling sound. It's short and doesn't continue until I move into first again.

Any ideas?

 
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if its coming from the passenger side dash area inside the car, its most likely air bubbles in the coolant flowing thru the heater core. either caused if you had a recent coolant flush or if you have exhaust gases in the coolant, from blown headgasket. or a leak in the cooling system can sometimes cause air to build up too.

 
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How long have you noticed the sound? sometimes it will go away by itself.

If you want to purge the cooling system of air there is a procedure to do it.

Basically, with a cool car (do not remove the cap when the car is hot) take off the radiator cap and let run for a bit and see if you notice any bubbling.

*note I accept no responsibility for this post, the above is just short sequence of what to do.