Abra has given you excellent advice. I agree with her. I'd like to add to her recommendation by commenting on your comment that you "have 2 months to get him to eat." This sounds like you've taken on the responsibility for him eating and will feel guilty if he's still not eating solid food in two months.
You are only responsible for providing food in a calm pleasant atmosphere. It's his job to eat it. You cannot make him eat. Often we parents feel that what our child does or does not do, to include eating, is our responsibility. That is not always true, especially with eating. We provide the healthy food and atmosphere. You are asking a good question about how to provide the food and atmosphere? I added, how does the parent find a way to feel less stressed and/or guilty about the process? In my earlier post I answered that question in a way that could make you feel worse.
What I meant is that when we feel that we must make the child eat we feel that we've failed when he doesn't eat what we have given him. Sometimes we then just give him what he will eat fearing that he will not be healthy without food. One lesson we are teaching to our baby/child in this sort of situation is that if they hold out long enough we will give them what they want. It's a whole lot more complicated than that and can have unforseen results.
I must apologize for my first post. After reading other answers I realize that I came across as judgemental which was not my intent. I was thinking that you are trying too hard to get him to eat more solid food and then giving him the soft food thinking that he had to eat and it was your responsibility to make him eat something at least. I made the assumption he didn't have any sensory disorders and still think it's unlikely based on our family's experience.
I am revising my original message and adding the following information since the possibility of a serious condition has been brought up. I repeat, I see nothing in your post to indicate a serious condition.
My grandson has a sensory disorder which resulted in a different problem for him. He needed a mouth full of food with definite texture apparently so that he could feel that he had food in his mouth. I hadn't thought about a child having the opposite problem. His mother took my grandson to the Multnomah County Educational Service District for evaluation when he was 2 1/2 and we realized that his speech abilites were not increasing. (I don't know if this is the same program mentioned by another mother as early childhood intervention and involved with Head Start but it could be.)
Federal law requires that all school districts provide evaluation and treatment, free of charge, for any condition that interferes with learning. One program is for ages up to 3 and then there is another one for after age 3. The first program is more intensive and does provide for more in home therapy and support than the second one. It may be the earlier aged program is called the Early Childhood Intervention Program.
Difficulty with eating is just one difficulty that might indicate a sensory disorder and thus a need for intervention. Difficulty with speech is another one. Googling sensory disorders on the Internet can help a parent understand these disorders and the possibility that their child might have a sensory disorder or not.
Perhaps the doctor has suggested a therapist because of a sensory disorder. However, there are are many kinds of therapists and I wouldn't assume that the doctor is considering a physical disorder. I don't know what issues your doctor is considering. Since you said he was giving you two months to get him eating solid foods I guessed that he wasn't talking about a specific physical disorder such as a sensory disorder because it is best treated by early intervention. A child gets the best free intervention help before the age of 3.
My grandson has had a physical therapist, who deals with the way the body works, an occupational therapist who is the one involved with teaching how to deal with specific physical everyday activities, and a speech therapist as well as a social worker who is also a therapist.
He also attended Head Start as a part of this program and is doing well in a special education kindergarten. He'll begin to be integrated into the regular classroom in the new school year.
This long and intensive path of therapy for my grandson did not start with a simple inability to appropriately eat. In fact none of us noticed that he was eating any differently than other children even tho he was.
You can call your county Educational Service District and talk with them. They will make an appointment for an evaluation if your description of your child's behavior indicate the need for an evaluation.
As usual I've written a too long message. Take from it what is helpful for you.