‘Water’ they at!! Another Game of Thrones blunder in the finale! NO SPOILERS

After 73 episodes, Game of Thrones has finally come to an end.
The series broadcast its last ever episode overnight but many aren’t happy with the final series as a whole.
Some feel the drama has suffered because author George RR Martin hasn’t actually finished writing the books.
One thing that was noticed earlier this season was a Starbucks coffee cup on the table, but now there’s a new error!
A plastic water bottle was seen in the final episode, which we doubt is something they would have! What do you think?? A small mistake or big blunder??