Yes to water at the ports as long as it isn’t a case.
Yes to getting off in Seward as long as you are back on board before sailing which is normally 30 minutes before.
LeBistro is wonderful, highly recommend and Teppanyaki is just OK in our minds, it’s fun if you have a fun and active table or you’re with a group but we’ve done it with less than enthused diners and it sucked, it’s more about the entertainment then the high quality of food.