Wrap in bubble wrap/carboard and place into a box. Then go to the post office and tell them where you want it to go. They may make you sign a customs declaration form but apart from that it should be hassle free.
It would probably help to have the bottles looking half professional to "fool" customs on our end as if they suspect that it may contain viable seeds or any other organic matter that they deem unaccaptable. Maybe put the sauce into a bottle with a pro label already on it and advise Neil what is in the bot-bot.