How to I keep my smoothie from separating?

I've recently started using coconut milk powder for my smoothies. It gives you the emulsifying factor and creaminess without all the excess liquid as watermelon is very, well, watery. And for folks who don't use yogurt, coconut milk powder is an amazing option. Added bonus, I put it in my coffee too!

I haven't but why not? I've tried everything else : )

Have you tried activating your seeds overnight in the liquid? It is good to activate them and perhaps this will also help with separation.

Droplet: Thank you for the link, yes, that's exactly what mine looks like. I guess I'm just going to have to live with it because I love the taste so much. oh well. I want to thank everyone for trying to help me solve this mystery. This is a wonderful site, I'm so glad I found it, I've told lots of people about it : )

https://food52.com/recipes/32970-cure-for-what-ails-you-smoothie
Here is a wonderful recipe for pineapple smoothie from Emily, in case you want to give it a try. If you look closely, you can see that it separates as well, even though she uses considerably less liquid.

You're using a lot of water, without much to bind it beyond the chia seeds. I'd suggest decreasing the water by half and doubling the chia seeds.

I understand the coconut milk you're referring to. I made the almond milk that I used. What I meant by pineapple juice and vinegar both being acidic is, taking the vinegar out didn't help because the pineapple juice caused the almond milk to sour. The recipe is delicious, I love pineapple and coconut together. My blender is incredible and there are no pieces of anything, but for some reason, no matter how little water I add, it's always separated.

Susan: This recipe is one I've developed over years of research of different foods and what my body needs because of various health problems. Even the herb/spice blend is different amounts of certain ones. Pineapple juice and vinegar are both acidic, I tried almond milk once and it basically soured the smoothie.
Droplet: My blender is a nutribullet, it will grind flax seeds in about 5 seconds. It's blending everything really well, it's smooth, just separated. However, I took your advice and blended everything with as little liquid as possible and then the rest and blended again and it didn't help.

Both pineapple and coconut are fibrous and somewhat tough, so probably what is happening is that they are not really being broken down well enough by your blender within those 20 seconds, and the pieces naturally float up as soon as the whirl stops. It is best to first add only a little bit of water and process, then add the rest at the end. That way more friction is created, as opposed to the ingredients simply chasing each other in a watery environment. Hope this helps.

I think coconut milk to replace the oil and maybe half a banana would do it. With just water and vinegar as liquids, it needs a creamy factor. I wouldn't put vinegar in a smoothie, but you must have a reason.