Ya man I do a week on a week off, so one week distilled water and the next week organic nutrients, i use fish juice, you want something with higher levels of nitrogen and potassium (the first and third number), when your flowering you'll want something with higher phosphorus (the middle number). Like 420bongrips said, start with a solution that is more diluted than instructed on the packaging and work your way up, you can go past the recommended does in time......the plants will handle it......if you are giving too much you will see the tips of the leaves start to burn, if theis happens, give em a flush and just use water for a while and then try again until you get the swing of it.........Hope this helps.