Big Bud Usage Help!

Hello everyone! So i ran my nutrient feed this week, and run it every other feeding as usual, but i'm finishing my 4th week of flower and ran all the nutes EXCEPT big bud like an idiot cuz i forgot to grab it. The next feeding is obviously just water and couple of other things. and by the time the plants run dry it will be the first or 2nd day into the 5th week of flower. So my question is can i use big bud with out the base nutrient (iguana juice) since i just fed it the base? can i feed it with water JUST for this circumstance??? thanks!!!
 
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