Welcome to the forums and congratulations on your new budgie friend!
You have certainly come to the right place as you will find all you need to know on budgie care here.
If you are relatively new to budgies, the information on the several articles and sticky threads located at the top of each section of the forums will be extremely useful.
In order to make your budgie more comfortable and to help him in the settling in process, you can cover the cage on 3 sides (leaving front part uncovered) and have some background sound from the TV or radio for him. Soothing music works very well and can even encourage your budgie to sing.
As to the water, new budgies can be especially sneaky and will take a couple of quick sips when we aren't looking.
Unless your budgie bathes or manages to dump some of the water onto the floor while mischievously playing, you won't notice a difference on the water consumption. This doesn't mean the water doesn't need to be changed on a daily basis.
Sometimes we may even have to change the water more times in just one, if the water gets soiled.
Best of luck with your new budgie friend and feel free to share some pics of him when you have the chance!