I know you can get a battery back up,, but they only last a few hours.. not much good if things go bellly up for days on end.
Can't afford a radio set up and realy don't want to have to spend time money don't have getting a licence and set.. guess you'd need a battery back up for that aswell
If I where in your shoes, and of course if money permits (its seems to be that age old question) i would look into a getting a gene .. battery banks are ok ive a few myself just small pack size ones if you ration the power the Anker and Samsung I highly rate, but a generator would be much more beneficial to you in you, you can pick the up on the market place second hand pretty cheap, Infact if you are lucky the local tips have them come in sometimes and will sell them at a fair price.
Just safely store say 10L petrol with some fuel stabiliser should be good for say a year and just rotate it from there.
As for radio it all depends on what your wanting really, it can be relatively cheap to setup if you look about, CB doesn't need license anymore Ofcom abolished that in 06, HAM you need licence as you most probably know, its mostly free apart from booking the test itself, I think you'll find HAM equipment can come with a bit of a price tag, I'm not completely ofay with that side of things, you can get them Baofeng radios are pretty good one they are set up you got rhe 5w little £20/£30 things UV-5R or something and the 10w can't remember the price of the top of my head.. they ain't to much more say £50 get yourself a one of them folding whip antennas if mobile or i reckons you could set up a half decent home based antenna.. a lot of it is down to what your local terrain is like what obstacles will your transmissions encounter the higher the antenna the better.
Antenna antenna antenna, thats what you biggest thing to focus on if anything first.
I mean don't get wrong i don't know a mawhosive amount about coms and I'm sure there is others on here who know way more than myself but I think its doable!
I'm on CB myself, its nothing like it once was admittedly, but there are people still out there, I managed to pick someone up in Ireland last year with my T2000 sat on a hill with a silver rod set up so it was above most obstructions and im in East Anglia so was pretty happy with that he must have been putting some power out though to reach me if I managed to pick him up
Any how.. sorry went on a little bit there haha, I hope something in that essay might be able to help you somewhat.