Fresh Water Tank fill ideas?

Have no idea if or how well this would work. can't tell how big the opening is to pour and it looks like you would have to lift up a lid. see no reason for lid so maybe you can take it off. Probably not use or order it myself but here you go I saw this. There looks to be threads but believe they are just barbs to hold this inside the fill hole.

https://accessories.lazydays.com/camco-rv-ivory-water-fill-bulk-37002-10-0751?cid=52-0013-05&gclid=CjwKEAjw387JBRDPtJePvOej8kASJADkV9TLAxCObK695yD_uXjURlSDTAxUR0z4Lnd1R9B-b4wf7hoCLq7w_wcB