1. Check all your items- make sure they are rated 100-250V
2. If #1, then all you need is plug adapters. (Not 'voltage converters'.) Airport will have them, JFK or FCO. or amazon them. I have a '3 to 1' tap that lets me plug three US devices into ONE us plug:
I take one adapter, for whatever country I am in, then gang all the chargers into that...