Hi Mind!

You can use the pH Up! in your laundry (if it's Sodium Carbonate) as a nice booster.
Alkalinity Up! is baking soda. You could use it to keep your fridge sweet-smelling.
pH Minus can be replaced by either Muriatic Acid, available at hardware stores. Muriatic is the best way to lower pH but you do have to be very careful using it--wear goggles and gloves, pour it into a 5 gal bucket of water before adding it to the pool.
But pH Minus is what is generically called "Dry Acid" and is sold as that, much cheaper. Also easier to handle than Muriatic Acid.

What needs to be stated explicitly: Generally, if your chlorine level is good and your pH level is good, your pool is safe to swim in.