I tried that when I first started brewing. Just put them in the oven and slowly bring temp up to 350, then cool. Seemed to work OK, but I use StarSan now.
Heat treating my bottles is the way to go, some might call it a waste of time and energy. I'll just call it peace of mind. I've tried the star-san thing and it left a bad taste, whats the point of using a no rinse sanitiser if you have to rinse . Just clean your bottles stack them in the oven set to 350 for 30min the night before you bottle and don't open it untill you are ready. as for the caps I boil a few cups of water for 15min turn off the heat and throw in the caps.