The families of Bianca Jones and Holly Bowles have arrived in Thailand to bring their bodies back home as tributes pour in.

An Australian teenager has become the sixth foreign tourist to die in a suspected mass methanol poisoning in Laos, as a growing list of countries warned of the potentially fatal consequences of drinking tainted alcohol in the Southeast Asian country.

Holly Bowles, 19, had been in critical condition on life support following the poisoning in Laos more than a week ago.