comment targeted individual said the following.

Identify the person. That person was me.

15 gallon containers

Drums stacked in a row will have gaps between them.

1.3 Gallon Collapsible Water Storage Bag

Their odd shape will create gaps between the water bags when stacked as a wall.

Rectangles and squares stacked in a row have fewer gaps. See the Shielding: Water wiki for these tanks.

pool water bag 10ft long and is it 1ft wide

Water weights to hold pool cover in place. Bad reviews on intheswim.com and amazon.com

https://www.amazon.com/Blue-Wave-10-ft-Single-Winter/dp/B003TQMDP2?th=1

Please do not recommend crap. Take the time to read reviews.

6 mil poly tubing

How does that hold water?