Refilling Stations?

No; the margins of profits for the vendors will be less than what they are now. and there will be a hue and cry from the manufacturers and vendors of plastic packaging materials, can makers, card board box makers, and so on, and the well paid professional "packaging experts". but your idea is very good. In the Dairy Cooperative Societies in some parts of India, cattle feed is given to farmer members as loose pellets; they can put them in the containers in which they bring milk to the society for sale. so the idea is eminently practical, provided the profit motives do not interfere.

And importantly, most importantly, NEVER BUY OR DRINK COKE - NOT EVEN A DROP OF IT - canned, bottled or loose!!! Farmers in India found that coke is an excellent pesticide. So, if you are not a pest, coke will make you one, and kill you.

While manufacturers will not like this scenario As it will lower their profit margins, you can already do this to an extent now.

At a food CoOp, you can buy foods in bulk by bringing inn your own containers. Not every town has one, but you could always start one.

Coffee is already refillable in most grocery stores.

Don't drink coke. They have a terrible human rights record in a number of other countries.