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It rather depends on the size of the bottle. For instance, a one litre capacity bottle will hold one litre of liquid.
2 coins come in lots of different sizes and so there cannot be a simple single answer.
90cl + something cl = 1 litre
Erm, 1 if it's a 1 litre bottle.
Assuming that it is a half litre bottle of water, the water would have a mass of 500g so the bottle would have a mass of 95g. However it might be a pint bottle of water, in which case the water would have a mass of 568g, leaving the bottle with a mass of 27g.