For the most part, electrolytes and the need to replace them doesn't come into play for anything under at least an hour - and in many cases up to and beyond 2 hours. Same for food.

Everyone is different - different needs. But for me, if I'm not planning on riding more than 2.5-3+ hours, its just water. Maybe I will add some electrolytes if its blazing hot out - but not for 1-1.5 hour rides.

Daily general rides for exercise - typically no electrolytes and limited sugar/food. Long weekend events or heavy/intense sessions - then I add some.