These are pretty well liked in the camping community, and they are pretty well made IMO

https://www.amazon.com/Reliance-Products-Aqua-Tainer-Gallon-Container/dp/B001QC31G6/ref=sr_1_4?crid=188BU925CUZ5H&dchild=1&keywords=reliance+aqua-tainer+7+gal+water+container&qid=1571190451&sprefix=reliance+%2Caps%2C247&sr=8-4

This is a more common shape

https://www.amazon.com/Reliance-Products-Jumbo-Tainer-Gallon-Container/dp/B000GKDFH4/ref=sr_1_5?crid=188BU925CUZ5H&dchild=1&keywords=reliance+aqua-tainer+7+gal+water+container&qid=1571190481&sprefix=reliance+%2Caps%2C247&sr=8-5

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I've got a pair of the reliance desert tanks. They have poor reviews, but I've been bouncing them around the desert for about 5 years without a leak.

I prefer these 7 gallon jugs. They're a LOT stronger than 5 gallon bottles and hold more. You can also stack things on top of them when packing your camping gear whereas the 5 gallons can break pretty easy if you put something on top.

I also use these jugs for fish tank water (RODI) and keep 6 full in my garage just in case we have a water issue. They're stacked 3 high in a cupboard.

Buy a couple of these and fill them with tap water. They work great, I keep one in my car when I go on long road trips and/or hiking. No funky taste even after days in the sun.

https://www.amazon.com/gp/product/B001QC31G6/ref=oh_aui_search_detailpage?ie=UTF8&psc=1