Bleach solutions are the usual way to sanitize the water system, yes.
The important ingredient in RV antifreeze is either ethanol (i.e. normal grain alcohol) or propylene glycol or some blend of the two. The ethanol based ones are usually a little less expensive and probably for that reason more common. Ethanol in particular can have a noticeable odor (and flavor).
By the way, automotive cooling system antifreeze is commonly ethylene glycol based. Winter windshield washer fluid usually uses methanol (wood alcohol) to prevent its freezing. Both of these chemicals are quite poisonous and for that reason obviously have no place in an RV water system.
