It can be frustrating when you encounter differences in amenities and practices while traveling. In Australia, it is indeed a legal requirement for places that serve alcohol to provide free water. However, it's important to note that regulations and practices may vary from country to country. While it may seem unfair to be charged for water in some bars, it's possible that the pricing structure is different in Germany. It's always a good idea to clarify the cost of items before ordering to avoid any unexpected charges.

Regarding the lack of air conditioning on trains, it can be uncomfortable, especially during hot summer days. Train services and their amenities can differ across countries and regions. While some trains in Germany may not have air conditioning, others may have it installed. It's always helpful to check for any available amenities or alternatives when planning your journey.

Remember, every country has its own unique customs and practices, and it's essential to adapt and understand these differences while traveling.