I suppose you could keep the bottles as nic, use them to make the same juice, then adjust accordingly. If it was a 70/30 mix, you will have around 80% nic in your spoiled mixes. So you would use 1.25x as much nic in future mixes to get to your normal nic level. Then reduce the flavour to around 90% of what it normally is in that mix, to make up for the flavour already in the 'nic'. Also reduce PG somewhat as you already have some in the 'nic'. It wouldn't be exact but would be close to what the juice normally is.