theres some olives you can buy in yellow and green sachets, come in 80g portions I think, they arent too oily, I think are in brine.
The thing is, acid may affect ketosis, oil wont -it will just affect weight loss. I see olives as a nice treat, and 200g is a huge amount, you wouldnt normally eat that many olives anyway.
pepper is great, I chuck it in all the meals esp the macaroni cheese -takes the edge off the cheesyness!
salt does affect water retention indeed, although Im not sure how the sachets work in way of recommended sodium intake? when I was doing LL I actually ended up with low blood pressure and was advised to increase my salt intake!