I didn’t have the Jarritos, but did have wee bottles of fever tree grapefruit soda. This is 2oz tequila, juice of one red grapefruit, double strained, and 4oz soda.
Sorry for the super casual picture - the pitcher handle in the back is the tepache currently fermenting.
Because the fever tree soda isn’t as sweet as Jarritos or Squirt. And I had a grapefruit. It was good, lighter and less sweet version but my favorite is definitely Jarritos Toronja, plenty of tequila and enough lime to make it palatable.
So if I am using Fever Tree or San Pellegrino, it is not sweet enough to need lime, basically - grapefruit juice still gives it the fresh element.