Tacoma won't start

Hey, new to the site and I'm hoping someone can help me out. Excuse me first off, I'm not that handy when it comes to vehicles. I have a 2012 Tacoma and today I went outside and started my truck and it started fine. I had to run back inside so i turned it off and 2 minutes later I went back out and it was dead. Not even a click. I boosted it with another truck and i started fine. I drove it no problem for about 20miles. I turned it off and tried starting it again but it was dead. I was thinking the alternator but not sure... any ideas would be greatly appreciated. I live about 200miles from the closest Toyota dealership.

 

Thanks i'll have them check it.

 

Probably the battery.
Before you start it, can you turn any lights on?
If not? Battery or baterry connections

 

Battery all the way.

 

perfect i'll take the connections off, clean them and see what happens! Thanks!!!!

 

It was the battery, thanks again for your help.

 

W00P. Awesome.