Problem -

When good-hearted, extremely nice folks invite you into their homes to stay for multiple days, drive you around,s show you their very cool foreign city and indulge your every question, then feed you every morning and night with highly delicious scrumptious foodstuff of Polish delight, how do you refuse their urging to have a beer with them at night, as in, they're holding a cold one out to you already poured and you can sense that a refusal will be met with confusion that their major hospitality is not returned with the minor symbolic gesture?