Please help

My baby turns one this week and weve been struggling with feeding since day one.

He's happy going without food if we don't offer. He either closes his mouth or spits out his food and i cant handle it anymore. I have no idea what to do especially since my milk supply is super low.

I cant consider baby led weaning because he gags and vomits way too easily doing that. We have to mash up his food. Not puree just mash.

He also will only take about one or two sips of water only so if i wean he'll be dehydrated.

Please help