Apenta is a still and sparkling Hungarian aperient water. Its principal constituents are sulphates of magnesia and soda. The water's source were the Uj Hunyadi springs in Buda.The Dublin Journal of Medical Science, Vol CII., Jul-Dec 1896
See also Mineral water
References
https://timesmachine.nytimes.com/timesmachine/1896/06/14/503185562.pdf