Just get a well know brand veg, bloom, and micro liquid nutes. You dont need any additives, but having some liquid ferilizer around will help your yield.
A few brands that will work just fine would be like botanicare, fox farms, house and garden, advanced nutrients, canna, soul synthetics, roots organics, nectar of the gods, green planet, heavy 16. (No paeticular order)
Like i said, you only need the base formulas to get results. A lot of the suppliments are for hobbyists or those who can dial a plant in.
You def can use plain water and soil, but you will run into some defeciencies down the road. I have done it, and it makea great smoke that hits super smooth, but you wont get half the yield your first time as using half strength nutes every other watering alternating with plain water.
Keep it simple the first round or two and youll learn a ton this firat round.
Good luck bro