Bubly Drops Holder - Sodastream

I'm new to 3D printing and this is the first model ever I created myself in Tinkercad. I know its very basic and can absolutely be trimmed down to use less filament. I was tired of seeing the stock cardboard box on the counter for these Bubly drops and having the bottles tip over when trying to reach for a flavor. So I decided to make a little holder for them. The standard flavors come in a 6-pack so I made this hold 6. I found out only after I made it that it looks like an upside down building block. Go easy on me, this if my first ever model I created. (I barely know what I'm doing).