Keeping pigs thro winter can be done and is not for the faint hearted.
A lot depends on your land. If you're on heavy clay and have to keep them outside i would rethink your plan or have somewhere they could be relocated in the worst of the weather( a barn or building of some sort). They will be ok in an ark preferably wooden with plenty of dry straw, pull out some of the old straw to make a straw doormat for them, that way they won't drag so much muck in their house and keep them topped up(pull out some of old then refresh).
The other main problem as mentioned is water and keeping it flowing especially if you aren't on mains. Pigs must have access to water at all times (i've seen me out 2 or 3 times during the day to smash ice on water troughs)
The other problem is if you work full time you're only going to feed up during darkness both am & pm and you might miss things going on with your pigs so you either need lights of the flexibility to feed at least once a day in daylight hours.
Depending on how hard a winter we have you may need to feed extra but you'll be able to judge this by how your pigs look. They can burn a lot of fat just keeping warm if you don't keep them warm enough.
Also from a keepers point of view you need to be prepared to turn out in all weathers twice a day (more if conditions dictate) so make sure YOU have the appropiate kit, waterproof trousers, good wellies, thick socks etc. I don't want to put you off keeping pigs thro winter but just be aware of what's involved. Crawling about in wet mud trying to get escapee piglets back in is not my idea of fun whne is persisting down and blowing a gale!
HTH
Mandy