For Aus to Britain ... yes take a water purifier. If your going backpacking (by buss) then you won't need one.. but on the bike you'll get to some remote places (other wise why take the bike?).
The other way to purify water is to boil it .. for 15 minutes on a rolling boil. Best with a camp fire.
On the tuna .. tins or aluminum pack .. the tins are cheaper .. take more bumps.. and have about the same amount of liquid. I take 3 minute rice (takes less fuel to cook) in those plastic bags .. and a tin of tuna .. cook (with all the liquid.. may as well consume what you pay for).
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Regards Frank Warner
motorcycles BMW R80 G/S 1981, BMW K11LT 1993, BMW K75 G/S
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