A de-humidified room, with a vast temperature increase.
Restraints:
A straight Jacket, that binds his hands across his chest.
A respirator mask, connected to a mini de-humidifier. The mask covers Akigo's mouth and noise and dissipates all but the bare minimum of water in his body. As a result he gains a dehydrated almost mummified appearance.
Covering his feet are vulcanized rubber socks, combined with a metal cell, keeps him from absorbing water.
Travel:
He requires the use of a specially heated metal transportation dock. It has the same concept as his cell. Its shaped like an iron maiden, and even features heated prods, in case of “disobedience”.