do what comfortable for you girl,i just did it like this ,because id smoke a bit,go in there freaking stoned ,think to myself ,well used this much yesterday and this morning and blow off checking stuff,then wake the following morning to very unhappy room if you dig,even in the city my damn water would change daily,i got were i kept a 33 gal thrash can on back porch full of bubbling water,never turned them off,go out a get what i was gonna need and dilute it with ro water to save money,bubbling also raise the ph of your water threw the air,so after last feed for the night,i got my water in 5 gal bucket ,let it sit in house all night,following morning ,i mixed the water ,then the days feed,worked out really well,only the one time i had issues and that was when i mixed every feed and stoned ,damn stoners cant depend on them for shit haahah.