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30 litres of water weighs about 65 pounds, so a fit person should be able to lift it.
One foot of water is merely the depth. Without the surface area, it's impossible to tell how many pounds it gives.
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.
If the bottles are identical, then the bottle of waterhasmore mass in it than the bottle of steam.
Water-bottle or canteen.