What happens if you drink nothing but water?

So I’ve been reading up on the benefits of drinking water. From time to time we all bump into articles proclaming how beneficial it is to increase our intake of H²O.

It’s often claimed that drinking between 2 and 4 liters of water per day will lead to:

• weight loss
• decreased appetite
• better skin
• better sleep
• better mental fitness, better concentration, better focus
• ridding the body of toxins
• slimmer waist
• the vanishing of those dark circles round your eyes
• saving some money, since water is cheaper than other drinks

I’ve only been doing this for a week, and so far I’m only noticing this:

• I sleep a lot longer because I went cold turkey on caffeine, since I drink not a drop of coffee or tea
• My wife claims I’ve lost some weight
• I eat less
• I enjoy drinking water better than before, given other options I always reached for something else than water
• cheaper bills in restaurants and bars, because I don’t want to order more than one glass of sparkling water (why pay 2 euro for a glass of water??)
• I feel like my body is still adapting to not having any caffeine coming in, neither through coffee nor tea, so I’m tired most of the time
• A little less anxiety, since caffeine increases your adrenaline and puts you in fight or flight mode
• I haven’t noticed any of the other benefits, but I suppose one week is not enough to see any real results

I’m curious what will happen in a month