If you plan to drink (or cook) with any of the water in your aquaroll - then the container, the piping and taps need to be flushed with a solution of Milton.
This assumes that you left the taps open, so they drained down and dried out - likewise the aquaroll.
But if you left water in the system during storage, that will all be tainted, and you will need to flush a solution of Milton through the system more than once.
Then flush with clean water a few times - part fill the aquaroll, swirl and empty, then part fill and flush the piping.
For the hot water system, I'd be tempted to follow the manufacturers advice on de-scaling the boiler (heater).
I'd probably not use Milton on the hot water system - it is just bleach and may have a detrimental effect.
Robert