I bought a 64 oz (half gallon) insulated stainless water bottle this summer, the same brand as the one you linked. I have not used it for beer yet, but I did use it all summer out in the garden and on multiple canoe trips. It worked very well. One day, it sat out in the sun all day long while I worked in the garden. I went to take a drink, and the outside metal lip was hot enough to almost burn my mouth, but the water inside was still icy cold. Excellent.
The Fifty/Fifty brand was the least expensive that I could find. I ordered a Hydroflask brand one before I found the Fifty/Fifty. I compared the two once they both arrived, and even did a side-by-side test with ice water. The Hydroflask held temp a tiny bit better - but the difference between the two bottles was still only about 1.5 degrees after 8 hours in the sun.
Go for it! A glass growler will never hold temp like this will. :cheers: