Can one buy tomato juice?

Schweppes still make a 200ml bottle of tomato juice-it has a little salt but don’t think there are any other additives.

Here’s another:
thetomatostall.co.uk/shop/product/pure-tomato-juice-200ml

Oh, and a bigger one:
thetomatostall.co.uk/shop/product/pure-tomato-juice-500ml

I guess it is easier to make tomato juice by yourself.

How about buying a tube of tomato purée and making up a drink with it by diluting it with warm water?

Pure organic tomato juice from The Tomato Stall using Isle of Wight tomatoes. Comes in 500 ml bottles. Once opened it does need to be stored in a fridge and used up in 5 days. You can buy it online and have a repeat subscription at www.thetomato stall.co.uk

Elderly Person "So if I had a litre of tomato juice and drank say, a third of it and put the rest in the fridge then when I wanted to drink some I would need to dechill it in some way, perhaps pouring some into a glass, covering it and then stand it for hours." No, a splash of boiling water would dechill it much faster than that (watch out you don't crack the glass). Refrigerating it isn't relevant anyway as you don't have a fridge.