Good hydro chemical starting kit?

I very recently began my first grow. I had planned to try and just use old aquarium water, which has a good amount of nitrates, but that does not seem to be working. So I want to get some hydroponics chemicals stat. In another thread MrGreenFingers recommened Mega Grow and Jacks.

For Mega Crop, does this look like the correct one - first one on this page for general growth I would assume? https://greenleafnutrients.com/shop/

For Jacks Hydro, does this look like the correct...

Good hydro chemical starting kit?