Hey travelling foodie, well done on getting invited to the medical!
Like you I was contacted about the water competency request last week, but have heard nothing else.. Melbourne base seems to be at slower pace than Sydney... I suspect there may be a ground school for you coming up, because doesn't the medical have to be within 3 months?
As for the drug/alcohol test, hmm I thought Bodycare previously did that on the day, did you get charged the full amount of $300 or whatever it is?
Perhaps they are planning on testing closer to accepting candidates into the GS if it's a few months? Let us know what they say if you get in touch with TA. Anyway, huge congrats to you! Keep us posted.