Posted by:
The Oncoming Storm - bc
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Date: October 23, 2012 02:21PM
The Gospel Principles Manual is probably as authoritative as you can get as far as being an official church statement:
https://www.lds.org/manual/gospel-principles/chapter-25-fasting?lang=eng"Fasting means to go without food and drink."
"One Sunday each month Latter-day Saints observe a fast day. On this day we neither eat nor drink for two consecutive meals. If we were to eat our evening meal on Saturday, then we would not eat or drink until the evening meal on Sunday."
To be fair there are a number of statements about drinking water being OK when it is a safety concern such as very hot climates, etc.