I have a 15mo daughter with swcah...we stopped giving her salt supp when she was about your sons age, and just salted her food. salt seems to go good with avocado, apples, green beans, potatos (mashed, baked, sweet pot, etc..)..I use to LOVE watermelon with salt, so we’ll try that with her when it’s watermelon season. We dont salt everything, just a few times a day. Oh...and she loves pretzels, I think because of the salt.
hope that helps