I tell my kids, to get it themselves.
FOR those things/items that I KNOW they can.
My son is 4 and he is great about doing things on his own.
My daughter, the 1st born, is not so much.
So I always, just tell her, she is to do it herself. Since she can.
My kids, even if they can access snacks/foods etc., DO.NOT.OVEREAT.
They know their bodies cues for hunger or fullness.
AND they ALWAYS ask first... if they can have something.
The do not, just go and eat or grab something, without asking or letting me know.
And we don't have junk, in the house.
So, I really have no fear or apprehension of them, doing things on their own or getting things to eat on their own.
Whether it be from a cabinet or the fridge or the freezer.
I also taught my son, from a little before 4 years old, how to use the Microwave. And he can.
He even knows how to scramble and cook an egg, with my supervision.
To get water, the kids go to the fridge.
It is fine.