Is it possible to sterilize my grolsch flip top's,rinse and the put the caps in place so that i can use them in a few days time(this will save lots of work come bottling day)?
It's certainly possible...the question is whether or not it's advisable. Personally, I sanitize everything just before I'm ready to use it (within a couple of hours...usually less). I'm sure there are many others who sanitize days or more ahead of time.