Miracle Grow, a box is 5 bucks. i use a 10-10-10 for vegg and a 10-52-10 for flower , for both boxes its 10$ and theres enough to feed 10 plants for an entire grow so if you only have a couple plants it should last a couple grows, you want to be able to increase the dosages as your plant(s) get used to the nutrients they will uptake more.
if you want to just go with what u currently have just feed once a week and plain water once a week.
people dont like Miracle Grow. not ure if its because they have tried it and it didnt work that great or if its just because its popular to not like it.... i uused it for my last grow with decent results, would have been better if i didnt allow my girls to get root bound so badly. i have never used any of the other fertilizers so i cant give a comparison but for the price it worked well.