Shaving 200 grams off a few components is minuscule. A full water bottle weighs about 3 times that much. Save weight by not carrying water.

Seriously, though, it's easy (but expensive) to cut weight on a bike. It's harder (but less expensive) to cut weight on your body. When all is said and done, which one would be more satisfying to you? If you like both options, well, you can do that too.