Rain Water Collection Project

I am working on collecting supplies for my rainwater collection.  I have the barn, the container, and now all I need is the gutter and cooler weather to work in.

330 Gallon Container

I was able to purchase the 330 gallon container for just $50.00.  Smaller ones go for close to or over $100 when I researched them over the internet.  This one had contained mineral oil and still needs to be cleaned out a bit.

Barn Site for collection

My plan is to collect water from the longest slop of the barn next to where I plan to house the pygmy goats.  I am still not sure where to put the collection container as it will probably depend on how much gutter I acquire or have to purchase.  We found some gutter on Craigslist to only arrive and someone else had gotten it.  I guess better luck next time.

I will post pictures when I get the project completed.

Does anyone have any suggestions on how to keep the water from growing bacteria while it is stored in the container waiting to be used?