The bigger issue is where you can return bottles for deposit.
If I buy a bottle of drink at the station, the only place I can return it is a supermarket. If I'm not going anywhere near a supermarket any time soon, am I gonna carry an empty bottle round for hours, maybe days, until I do goto a supermarket, just for the €0.15?
Don't worry about rising the price, make it so anywhere selling drinks in bottles has to accept returns. This is what happens in Germany.
https://www.dutchnews.nl/2024/04/deposits-on-plastic-bottles-may-rise-to-50-cents-next-year-fd/