Looking at your pix...I would take a fork and gently scoop under the rootball...and carefully transplant into a smaller (1 cup...?) prepared container. The larger the pot, the longer it will retain water, (especially if in moisture control formula's) which makes it virtually impossible for a newbie to gauge when to water and how much. Cannabis prefers a wet-dry cycle. Keeping the soil wet is bad for the roots and will eventually cause issues. Do yourself (and your plant) a favor and follow direction. Were there any acceptable options, we would have offered 'em to ya already.

Doubtful the problem is with the seeds. More than likely it's your "helicopter dad" approiach. (hovering and babying the babies to death) Keep in mind that in plant biology, virtually nothing good happens overnight. Patience.

Are you talking about getting your water from a kiosk? Unless you get it right after brand new filters installed...all you're buying is tap water run through potentially clogged/ineffective filters. A waste of time, effort and money. I recommend tap water unless you've killed plants with it already. But ph issues aside, usually if it's ok to drink, it should be good enough for the ladies.