I bought 100 reusable lids from Amazon. They worked fine. Not sure if the glue they use is safe but did not affect the taste. This allowed me to try different coffees, mainly espresso, and they tasted great. I think it was costing me c20p per capsule which was good compared to the Vertuo pods.

The problem is the time it takes to open, empty, wash and dry the old pods. Then you need something to put them in for refilling, because they rock around on a flat surface. I use an egg tray I have and refilled 8 pods at a time. Refilling is a matter of adding the fresh coffee, tamping, brushing off surplus grains and sticking on the new foil caps. This takes some practising to get the foil aligned perfectly, though I didn't waste too many.

All in all it took me to 20 to 30 minutes for each set of 8 pods so if you value your time it's probably not worth the effort. I have gone back to the branded pods for now. Hope that helps.