[Pamar]

In Germany water bottles have an automatic markup of 25 eurocents/bottle. Every supermarket has special devices that will scan the bottle barcode and give you back 25 cents for each compatible bottle you put in - the money is delivered as a coupon you can use at the cashier to pay for stuff (you can also ask for cash if you want).

[anexprogrammer]

Sometime in the 80s or 90s there was interest in introducing the same as plastic was starting to be used for more bottles. From memory it was very popular with the public at the time. Nothing ever came of it, so presumably the Thatcher govt considered it an unfair imposition on businesses.

So now we have towns and hedgerows full of discarded plastic bottles.

[oriolid]

Finland has the same system. A nice side effect is that since the bottles are supposed to be reusable, they are thick and sturdy plastic instead of the paper thin disposable ones.