Just to add to the response above...
If you can't find your team colors in Tulip, I would recommend you try to find Dylon for hand use. They would work better than Rit for your bolder colors because the water you use only needs to be warm. Rit I've only gotten colors like the picture on the box or bottle when I kept the dye solution boiling on the stove while dying. That boiling dye isn't ideal when you are dipping your shirts in. But the Dylon I was able to use Hot water from the tap and my old tulip bottles to apply. You won't need Soda Ash with the Dylon either, but they do recommend adding salt.