Catching Snails with Beer
It is pretty common knowledge that snails and slugs are
attracted to beer, but how does one make a trap
for the snails without it filling up with water, the dog drinking it or in my case having cane toads come and getting liquored up before a night of terrorising the countryside.
Bring in the Beer Can Snail Catcher.
Recycled from a humble beer can with the sides cut down to allow the snails easy access to their favorite drink. If you are really thirsty you can make many of these in one session.
Simply take a beer can, carefully use a knife to cut little ‘draw bridges’ into the sides. 
Dig a small hole in your affected area and place the can in so the ‘draw bridges’ are level with the soil surface.
Snails and slugs will enter the can and either drown or die of alcohol poisoning.
Homely Capers

Hi Ben, I am from Brasil.
I use the beer’s can to catch snails in my garden but they are “smart”. They all enter in the same hole that we use to drink our beer. Do it and you will be surprised with them.
I say to my friends that I drink beer to have the can empty to catch snails!!!!
Good luck!!
Adenir