Really pleased to hear that you have found it great fun.
On your
6. Invest in an automatic water tank with cistern. You can run it off a hosepipe. Clean it
out every other day cos muddy snouts are dipped in it.
If you run off a hosepipe and use the "hoselock" connectors, these can blow off with the water pressure after a while (sometimes days). If you turn the tap on so that it is just drippiing, this will provide enough drinking water, but if it does blow it won't create a swimming pool costing a fortune in wasted water when you find it 6 hours later. A drip will provide plenty of top up for the trough.