Christina,
Not to make you even more paranoid, but I just read an article today that there is one theory of some level of risk of North Korea causing a major shut down of electric grids, devices in our country. I think I read that in a Wall Street Journal article, but it could have been our local paper (though they typically don't carry that detail type news these days). If that happens while you are traveling, you might (seriously) just as soon stay in Italy for a MUCH longer period of time. The resulting civil unrest could be highly unpleasant.
If a war of the nuclear type occurs, it would likely be very quick on both ends.
Cash is usually king in a period of unrest, so I would suggest traveling with more cash (deeply stored in a Rick Steves neck wallet). If war (be in on the electrical grid or something landing on our mainland), I would guess (what do I know, though?) that there could potentially be challenges with ATMs under certain circumstances.
I do not think Italy would be a target in the next war (if it happens), and I personally think (but,again, what do I know) a major war would likely not begin that quickly. I think there is all sorts of posturing going on right now. Maybe I am just being naive and too positive, though..
But, it is impossible to plan for every adverse circumstance. I would suggest that you take reasonable precautions, enjoy every ounce of life while we have the lives and lifestyles we do. If gloom and doom happens, have no regrets.
I do plan to pick up a few extra cases of bottled water to stick in the basement, just in case. Let's hope world leaders operate in a sane fashion and not make unwise or irrational decisions, as it would not be a good result for either side of a war.
Safe travels and enjoy time with your family on your trip. One of the delights of traveling is that you (often) get to miss a lot of the day-to-day news reports (typed from someone who is a news hound and read/watches A LOT of news regularly). It is healthy to have news voids every so often in order to totally de-stress :)
I just found the article...it was The Wall Street Journal from a few days ago. We've been out of the country, so I was catching up on lots of back issues.
Here's a link:
https://www.wsj.com/articles/electromagnetic-pulse-north-koreas-latest-threat-against-u-s-1504435000