A liter weighs 1 kg; 30 l weighs 30 kg - that is heavy but most people over age 15 can lift it
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30 litres of water weighs about 65 pounds, so a fit person should be able to lift it.
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.
Fill the 5 litre bottle. Use the 5 L bottle to fill the 3 L bottle. Pour out the water from the 3 L bottle. Pour the last 2L from the 5 L bottle into the 3 L bottle Now fill the 5 L bottle from the tap. 5L + 2L = 7L.