You've got a RoadRunner sports store there. (We've got one here too) Go get a sleeve of Nuun (according to MrsValve watermelon flavor tastes the *best* of the artificial flavoring tabs and the taste is minimal- she's right). They're like $4 each, eventually you'll get a big box, but start with one sleeve. 1/2 a tab = the electrolytes from 1.5 bottles of gatorade but zero sugars. They fiz while they dissolve (it's not carbonating your water bottle/cup, just dissolving).
Your body generally does a pretty good job of monitoring electrolytes on it's own, but a little overexertion brings on the need.
fwiw, my running buddy was told by his running wife that he'd need salt tabs when he started running 1/2 marathons regularly. Obviously she was wrong. He came home from a run one day & his wife told him to go look in the mirror. & just like you get a salt line/stain on your shoes in the winter (some of you will know what that is) he had them on his face. Knowing that I was a long ass way away from running 1/2s regularly, no worries on my end, but came in one day after a cool, easy, slow paced, 10mile run - bam. Ditto on the salty face. (I don't do those tabs, & have only seen 2x on my) So when you start getting up there in mile, don't panic when/if you see it.
Also, at Road Runner, it pays to be VIP. It's $2. Pay cash for it. It's $20ish for some super VIP and if you pay with a CC it renews at the supervip rate! You'll almost break even money on your first sleeve of Nuun if you do the VIP.