Not sure how i came across this but for all you clamato lovers this may be an alternative. I have not personally tried it yet but did email their sales staff and they say it is comprable to motts. i placed an order from their on line store today so I should have it by the time we leave in feb.
It’s called ceasar pleaser. Just add water. The following is from their webpage.
Instant Tomato Clam Cocktail Mix
Simply add 1 package to 1 litre of water and mix well.
Excellent for travelers, outdoorsmen, cottage users,
campers, and fisherman.
It is easy to mix, convenient & light-weight.