The Meaning of Life, the Universe, and Everything.
Im wondering the same thing! I was playing MC and making a map with haste... Then I thought... I should use this in the item spawning server i know So I searched it in singleplayer but it wasn't there... Then I looked it up and found this forum post... Im sad lol
Don't get why they released Minecraft with so many features not completed and unpolished. Sure I get that they where under stress but really they could have planed it better.
Uff, makes me so sad
Minecraft isn't some single-release DS game that everyone forgets about later. It is a constant work-in-progress that is constantly and always will be being improved and updated. You should be happy that there are so many unimplemented features to play around it.
On topic: No, there isn't a way to obtain a haste potion in survival mode. However, with cheats enabled, you can do /effect <your username> 3 <time> <level> to get the haste effect.