I make my own and use refillable bottles I got from Amazon - link below. The bottles hold up in the dishwasher so they are easy to clean.

https://www.amazon.com/dp/B0B4VXG7YH?psc=1&ref=ppx_yo2ov_dt_b_product_details

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I make my own gels in a food processor. I use Banana + chia Seeds + honey + PB or fruit. Works for me and is easy to switch up flavors.