For casual skiing where you’re in reach of outlets selling drink, almost definitely not. If you’re planning a more extreme outing into the backcountry, then an insulated hydration bladder inside your pack is definitely worth considering – in fact, it could be considered essential.
Hydration is so important at altitude and having to take your gloves off, open your backpack and locate a water bottle is a waste of time, so having water delivered on demand via a drinking tube is a huge benefit.