There's no such thing as a daft question 
Water bottles - I bought two , one glass , one plastic about 250/300ml which mt boys never drank from apart from when GP1 was on his own after GP2 died and he slept in DD bedroom for company until we got GP3. I think he just wanted to be noisy though 
The main thing is finding one that doesn't leak - they are a pain in the tonsils- but go into a shop and look at the brand they use and check for leakage.
I can't remember the ones I got but the glass one has a little plastic carrot 'float' so you can see how full it is.
You need to fill right up, upturn and let it form a vacuum. It'll drip a bit then stop.
I use bowls in the Pighouse, (they don't use them either)
If the bottles are too big (the huge ones are mainly for rabbits) you have to make sure they're securly fastened (though the bars, mine had a spring with clips, easier than the wire loop)
Pellets - about 30-50g per pig , I like to give a few extra so there's no squabbling .The pellets have everything in one pellet unlike the muesli that they can pick at and leave bits.
Veg - mine have a plate am/pm (and grass if it's nice) maybe 4-5 different veg.
They need fresh water/veg /pellets daily.
Hay- they like to eat, sleep and play in. It gets flattened and manky, so change regularly.
You'll get an idea of how much they need (they'll tell you) GP1 and GP2 woke DD at 3am on Guy Fawkes to tell her that they were not impressed that the food had gone and how could she sleep when they were starved 
So DD came through to tell me. (They were in her room)
WRT to grazing, they can't have buttercups or daisies.
Plants from bulbs.
Docks leaves (though IIRC they can have smaller younger leaves)
My lawn is flipping covered in buttercups, DH mowed it/dug up the worst bits and now I have to skillfully arrange the run. I can put cardboard on any patches but they are adults so tend to avoid. You need to monitor the babies though and don't let them eat too much grass to begin with.