| A flat glass bottle. Much on YouTube on how to do  this but most of it is a joke.
 I can believe that a kiln is needed,
 not sure about the salt. One instruction says
 to use a toaster oven for the better part of
 a day. Uh, I don't think so. Sounds like a
 good way to burn out your toaster
 oven and heat up your house.
 
 If this item wasn't so heavy, I'd find
 a way of  putting a message
 on the bottle  and sending it to Spain.
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