Tap or Dechlorinated water

[Malum Argenteum]

Generally, you don't wasn't to add any medications or supplements except for things like regular vitamins and calcium, wound care ointments/supplies, and pedialyte when dehydration is obvious unless it is approved by a vet.

Supplementing vitamins and calcium for (rodent eating) snakes is demonstrably a bad idea. Rodent prey already has ideal or borderline excessive (in the case of Vitamin A) levels of all nutrients, and there is no reason for routine addition of more (and plenty of reason against, including messing up the near perfect calcium/phosphorus balance of whole rodent prey).

Supplementation needs are (a) taxon specific (the reptile family/genus/even species in some cases) , (b) diet specific (e.g. rodents vs fish vs insects vs other reptiles), and product specific (i.e. whether a product is formulated for daily dosing -- such as Repashy Calcium Plus -- or occasional/PRN use -- such as Repashy Vitamin A).

idk if it is common practice but it is just something i have been doing - picked it up while researching snake medical stuff

I'd be interested in links to data/research/recommendations on this. Since snakes don't perspire, and don't lose electrolytes in liquid wastes like most mammals do, the reasoning behind routine addition of salt and sugar to snakes' diets sounds like it might be interesting.