What type and size water bottle to take on the Camino de Santiago?

Water bottle on the Camino de Santiago
Water bottle on the Camino de Santiago

The question was:

I want to know what type of water bottle I should be buying and what size?

Will any particular made bottles (e.g. aluminium) have a funny taste?

Any recommendations for something that is very eco-friendly?

Read all the good Water bottle advice on the Camino de Santiago.