Can I Drink the Water in Nigeria (Lagos)?

No, it would be safer to sleep in a cage full of snakes on a nightly basis. Ok, maybe that's a little drastic, but in short, the tap water in Nigeria is not safe to drink. People generally drink water out of bags, called sachets. You can buy a 500mL sachet for roughly 6 Naira (the equivalent of 2 cents). Ladewa and Blessed water are the two brands that are generally thought to be the most reliable. 
Though, whether or not the sachets are actually just filled with tap water, nobody knows. 

If you're buying bottled water, just make sure the seal is in tact. If it's not, it goes without saying that the bottle has most likely just been refilled from the tap. 

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Do not drink tap water unless you filter it. Most people have a filter system in their houses.
After you have been here for some time you can start cleaning your teeth with tap water. Do not swallow, just rinse and spit. This helps you build a resistance to various things.
If you want belly palavar, drink pouch water. It is suitable for locals who have a certain resistance. New Expat should not drink it.
Stick to brand name waters such as Aquafina which also has some minerals in it.

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