From 2006-2011, Syria suffered massive droughts which caused substantial agricultural and economic problems, which then led to large internal population shifts and breakdowns in traditional social structures, which directly laid the groundwork for the Syrian Civil War, which in turn helped contribute to the wave of migrants/refuges moving to Europe and upsetting the traditional centrist political structures. Ergo, water scarcity helped cause Brexit.
Okay, slight exaggeration there, but it certainly did contribute to all the problems. Civilisation will be fine if we approach these issues rationally and logically, so, you know, we're probably fucked, but there's a decent chance we can pull it all together.
More extreme weather is going to cause more serious problems in Africa in the foreseeable future leading to even more problems for Europe. Of course that's some way in the future, so good luck getting the correct attention and money needed.
On the topic of water, it's snowing in London today, which is pretty nice.