*Begin with a container you like.
I have a sturdy basket with handles so I can carry it to any location where I want to spend time in spiritual contemplation. Tip: Avoid baskets made from cloth or breakable weave. Avoid baskets with mobile handles. Yep. Learned the hard way on this.
*Put in the spiritual study tools you actually use.
My basics are my Bible, my journal, and a folder with prayer lists. Because I find I often want to pray scriptures, I have included a book containing scriptures by prayer topic.
In addition, I have a small devotion book that sometimes helps me get "cranked up" for God time when my mind is foggy.
My basket also contains the tools I use during our family devotion because I tend to flow from one devotion time to another. If I start my day late, I begin with family devotion time. If I get up earlier than the kids, I spend solo time with God first then shift to family devotion when the kids get up. Currently, our family devotion consists of reading a Bible passage and sharing our thoughts on it. I like to record those, so the tool I have in my basket is the journal in which I jot down some of those morning devotion comments.
*I'm a cry-er, so many times when I pray, tears are part of the equation. Therefore, I keep tissue in my basket.
Tip: Do not overcrowd your basket.
If you use a separate "to do" list like I do, keep it near your basket's location.
If you use highlighters, multicolored pens, extra bookmarks, and study tools, include those in your basket. I have Bible apps on my phone that I use for this purpose. I also usually have a cup of coffee or a glass of water (now that I'm cutting down on eating ice), or I'd probably have a bottled water in my basket as well.