Hi there,
I do love that we've all had different experiences.... We've kept some weaners for the last four years - and used a plastic ark (by 'arkus'). It's been brilliant, we can collapse it each year after power hosing it down, and put it back up the following spring - clean and ready for another season. Minimal wear and tear.
We don't have a water supply automatically into the paddock, but do have a tap 100 yards away. We use buckets to fill up two tubs 2-3 times a day. We use plastic feeding bowls (horse trugs?) sitting in old tyres. Really useful since we can easily clean them out (when muddy snouts dirty the water), and none of our pigs have destroyed them.
We keep our pigs in paddocks, with an inner lining of electric tape. For the first four days we put hurdles around the ark, with an inner lining of electric tape so that the pigs learn to respect the tape and (importantly) learn to run 'inwards' if they touch the tape rather than run out of the area.... After a few days they get to enjoy a much larger paddock area - and the tape within the paddock fencing means our posts and stock fencing remains in tack and in good shape! We feed our weaners on 'growers pellets' and as much fruit and veg as we can muster from the garden and orchard....
First year we had Large Blacks, then Gloucester Old Spots, then British Saddleback, and GOSs again due this year... Have enjoyed them all! Have fun!