rhyme scheme of V1 is different from the other verses (unless it is an Intro with different melody)

She’s a jalapeño pepper.

Adds spice to my  night

A coolant for my jets is
Southern Comfort  on ice

For consistency with the other verses, you could just swap the lines around in the first verse:

She’s a jalapeño pepper.
Hot as the Laredo sun 
Adds the spices to my life.
Makes loving twice as fun.

or...

She’s a jalapeño pepper.
Hot as the Laredo sun
Makes life twice as spicy.
Makes loving twice as fun.

I like my second suggestion better because "spicy" is a word you can have fun singing at the end of the line, and the repetition of "makes...twice" is kind of neat.

The first one works great!

I personally don't like the repetition of the word "twice" but it's a question of taste. If you want to keep the word "spicy" at the end of the line and avoid the repetition you can go with "Makes life much more spicy".