Keeping "At Home" Help - Winter Edition?

Hey all! Woah, I haven't been on here in forever. :)
Anyway, I have an elderly mare who is currently out on pastureboard about an hour from my house. Due to financial issues (college takes money, lol), I will be moving her to my friend's neighbor's property, about an hour and a half from my house. My friend can check on her everyday from afar (she is right next door, of course), and do blankets when needed, etc. I'm buying an automatic dog feeder to dispense her drugs once a day (they have 6-day ones), and she'll have a round bale and probably two stock tanks for herself.
I have a few questions: 1) how long does it usually take for one horse to empty an average-sized stock tank? 2) does anyone use nets on their roundbales, and if so, what kind do you use? (I'd like to save money and make my own) 3) how do ya'll move your roundbales without a tractor? I have a big truck, if that helps. 4) how long does a roundbale usually last for one horse in winter, with and without a net.
Thanks everyone!

Depends on how big the stock tank is. My current horse drinks very little. I think she drinks maybe, maximum, 5 gallons a day. My previous horse drank like crazy -- probably twice that much.

I didn't. For one horse a round bale is a pain. More waste than anything. Even for two, I used to peel off rounds for them daily rather than put the bale out. My girlfriend used one of those bale buddies and it save a lot of waste, but she had three small horses at the time.

I would just roll it to where I wanted it. At one time, I would push it with the bumper on my Chevy, but it was an old Chevy. Did a number on my bumper!

Bales come in such a variety of sizes we can't tell you that. Plus, it depends if it's soft core or hard core so you have to go by the weight of the bale. I would guestimate anywhere from 15 days to a month...