You can make a cheese sauce with your cheese of choice, sodium citrate, and a liquid (e.g. water, beer, milk.)
Dissolve sodium citrate in liquid. Simmer. Stir in cheese. Adjust proportions until you have a consistency that you like. This may require experimentation and cheese consumption. For science.
Google it; looks like there are some super-complicated recipes, and then there’s “melt a pound of Velveeta with a can of Ro-Tel tomatoes and chiles on the stove for five minutes.” Try the second one, maybe?
One of my long time life hacks: Don’t buy chips and salsa at the store.
Go to a Mexican Restaurant and buy it there. Twice as good for half the cost. (I think I usually spend $3 for both the chips AND the salsa. I’d have to spend twice that at the store)
1/2 pound white American Cheese from the deli
1/4 cup milk
chop the cheese roughly, place it and milk in microwave safe bowl, nuke for 1 min, stir them nuke for 15 to 30 seconds at a time, stirring in between until smooth.
Feel free to add garlic, chopped green chilis or whatever floats your boat