Translation of "Store's" in Japanese

This store's hamburgers taste better than that one's.

このハンバーガーはあの店よりおいしい。

- This store uses a water filter.
- This store's water is filtered.

当店の水は浄水器を使用しています。

- This store's hamburgers taste better than that one's.
- This hamburger is better than those of that shop.

このハンバーガーはあの店よりおいしい。