For me, just keeping them in a place where I will see them at the time I want to take them has been key. I was accustomed to taking BCP right before bed each night so kept them in my nightstand. That worked for the prenatals (I take a multivitamin, fish oil, vitamin C, and Vitamin D) for a couple months, but when I got heartburn and started throwing up after taking fish oil I had to switch to taking them right after dinner on a full stomach so they would digest better.
Here are some tricks I've used:
- I keep a small bottle (originally held ~50 Benadryl) and put all my pills in it, usually about 6-7 of each. I refill it as needed. This way all the vitamins are in one place and I just have to shake out enough to get one of each pill instead of open 4 big bottles every time I take them. It's also handy for travel. Alternately you could get a sub-divided reminder pill holder with days of the week on it (my mom has a chronic medical condition and uses a 7x4 pill keeper to manage all of hers and take them at the right time)
- I keep this bottle on our coffee table where I will see it after dinner, rather than in my nightstand. If you have small children this may not be the best but it works for us now.
- set a reminder for yourself, either formally (like an alarm on your phone, there are even apps to remind you to take pills) or informally (develop a habit of taking them after brushing your teeth, before doing the dishes, during the theme song for a show you watch, etc).
Good luck, and don't stress if you miss some days here and there. As long as you are eating healthy the vitamins are mostly there as a safety net rather than primary source of nutrition!