I used plumbers insulation from plumbers shop for most of the water lines, long runs with 2 hoses I used 25mm corrugated drain hose from Bunnings 10m is $9, (same stuff I use for the van drain hose), does a good job, didn't worry about the clear hose it's very strong and flexible...
Wiring I used the plastic cable shielding, bought from Jaycar 20m was about $15 or less. Brake wires shielded the same and zip tied.......if you have PVC pipes, which they seem to be using a lot of I would be putting a rubber stone shield in front as that stuff will shatter with a good hit when it gets a bit older.............my grey water tank has a alloy outer skin screwed to it and is showing a few good hits.
On the old rig I even used 20mm clear plastic pipe over the water lines, had some doing nothing and worked a treat.