Moderation doesn't just mean you should have 100-200g of something every day.
The effects on your body from a daily dose of 200g of broccoli vs 200g of fish vs 200g/ml of Coke vs 200g of sugar vs 200g/ml of whisky are going to be very different.
Doctors used to (still do) say that 1 glass of wine a day is fine, and that is considered "moderation" but others now say that you should probably drink alcohol at most once a week to give your liver time to recover and heal completely, because alcohol is toxic. So basically no amounts are really "fine" or should be considered as "moderation". But at least if you give it time to heal that may just work - but still not ideal for your body.
A video expanding on this:
https://nutritionfacts.org/video/everything-in-moderation-ev...
And another article giving some examples for why "everything in moderation" is a bad idea:
http://www.trishamandes.com/blog/2014/5/5/3-reasons-why-ever...
Is a glass of water a day excessive?
Absolutely yes. I have only a cup of coffee (or the equivalent caffeine via tea) per day and get killer headaches if I skip a day. Whether this is okay or not, I'm not sure. I usually see articles saying three or four hundred milligrams is okay, but that seems like a lot to me (that's a few cups a day depending on how you measure your cups).
Am I addicted?