It's a very smart idea. I was told to do the same thing but didn't listen & had to run around the chemists trying to decide what to get while I could barely walk.... not nice. I also wished I'd had some formula at home because I didn't have enough milk so had to top up with it.

I used Avent bottles at first and I microwave sterilised them & all bottles will fit in a basic cheapy microwave sterilzier. Later on I changed to sterilizing solution in a big plastic container. This is what I still do & I find it's easy as.

If you do end up bottle feeding when bub is bigger I can recommend the Happy Baby bottles. They are cheap but they flow far better for older bubs than the Avent teats do. These are also what I'd recommend if you end up having to use thickened formula due to a chucky bubby.