It is possible to take your fruit/veggie purees out with you in a little pot so ds can still have them a bit after his milk feed sitting in his buggy - or you could try just taking some sticks of celery/apple/carrot for him to gnaw on to get the taste and to practise biting and chewing even if he doesn't swallow much to begin with.
At home, don't rush introducing solids, it's all about exploring the taste and texture foods to begin with, rather than getting them to eat, they work it out for themselves in the end whether you give purees or finger foods or a mixture of both. My dd has about 6x 150ml bfs in 24 hours (2x EBM in a bottle) which is plenty, and a mix of mashed and whole foods - she's quite confident with eating and moving food about her mouth now after 2 months of practising, and will try (altho' doesn't always like) anything you put infront of her.
Make it a relaxed and fun process and you'll both enjoy it more!
Ax