This test requires that you purchase two items.
The first a stick of antiperspirant. No deodorant. Antiperspirant and deodorant are two entirely different classes of products. Deodorant uses fragrances to mask odor, and antiperspirant uses aluminum to block sweat from exiting your pores. Check the ingredients when you purchase your stick of antiperspirant to make sure it does have aluminum in it.
The second thing you will need is a can of cheap shitty beer. Faxe will do. I highly recommend that you get cheap, and foreign, that way it will ensure the quality control is at a bare minumum and due to overseas shipping, there will be plenty of time to leach aluminum into the beverage.
If you are Danish, choose something other than Faxe, as your Faxe will probably be fresher than eggs from a chicken farmer.
Day One. Take your stick of anti-perspirant and apply some on your fingers. Taste it with your tongue. Notice the unique dryness it creates in your mouth.
Day Two. Open your can of cheap shitty beer and drink. Notice how it leaves a very distinct dryness in your mouth. Identical to what aluminum in your antiperspirant does.
That is all. Enjoy your Alzheimers.