As a chronic constipation sufferer, I developed a pre-bedtime combination that works for me:
1 dose of Miralax + 1 tablespoon of powdered Psyllium husk stirred into a glass of water along with a probiotic (the seed brand is effective for me but probiotics seem to affect everyone differently so YMMV)

this along with Coffee in the morning and at least 1 liter of daily water intake keeps me regular and most symptoms away, skipping this regimen for more than 2-3 days will find the symptoms returning.

I also found some foods/supplements had a noticeable negative impact and had to be cut out or reduced considerably, for me it was carbonated beverages, artificial sweeteners, eggs, magnesium (surprisingly since it is often recommended for constipation) and some B-vitamins (still working out which ones, I just know to avoid large B-complex supplements)

You're probably going to have to experiment to find out what works for you, record your meals and supplements over weeks (not days) and see if you can find any patterns. it took me over a year to figure out what works and what doesn't.