does bottled mineral water have an expiration date?

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I am asking this because I have 6 bottles of 5 gallons each in my house right now. There are only three of us using this and it's going to take quite a long time consume these so many gallons of water. You see this is what happened. When we almost ran out of water, I texted our mineral water supplier did not reply. The last bottle was almost drained so I tried many times more to contact him but still no reply. It so happened that a nearby water station dropped by the house and made an offer which is cheaper than my supplier. So I agreed to have him deliver 3 5-gallon bottles of water. Later that day, I was not home, my original supply came to deliver and just left the bottles in the house. When I arrived home, there, I saw 3 more 5 gallons of water occupying space. Now I'm worried because we usually consume the 3 5-gallon water in about two months or even more. I wonder of bottled mineral water has an expiration. The bottles are sealed anyway, but I am just worried.