Hi Annie, I'm sorry I wasn't able to respond to your question more promptly, and hope by now your starter has taken off and is rising like a champ! Bubbling is a promising sign, and patience almost always pays off when it comes to the sourdough starter creation process. However, if you're still not seeing any rise you might want to consider trying Debra Wink's alternative feeding plan, which I've recommended in earlier replies as a way of addressing the lull in rising that can occur around day 4 and go on for several days. 

The reason I recommend storing your starter in a straight-sided glass jar that is taller than it is wide is that it can be easier to see the starter double in size in this type of container. It won't harm your starter to store it in a ceramic bowl or even in a food safe plastic container, but the shape of the container may make it more difficult for you to see your starter rising in the way we describe. So, store your starter in whatever type of container works (I would avoid reactive metals like copper and aluminum, however), but if you're having trouble observing much of a rise it might be worth it for you to tranfer your starter to an appropriately sized jar until you're confident it is rising predictably. 

I hope this helps! Let us know how it goes. 

Barb

• Reply