Tip, Prepping for free a necessity to have

Milk jugs do you throw them away? I was thinking about it and I'm going to fill my empty milk jugs with
water. I know the jugs still smell like milk even after a good rinsing but hey,,, You're going to want to flush
the toilet do dishes and lots of other stuff other than drinking it. So what would be wrong with having 50 gallons of water in jugs that you were going to toss out? Only takes a minute or two good habit to get into.
Maybe a drop or two of bleach in each jug? Does anyone know how to get the milk smell out?

If anyone has a tips on the subject of storing water in milk jugs please post it.
The dog needs water too.