Sew an insulated cover for a baby feeding bottle or water bottle
https://so-sew-easy.com/insulated-baby-bottle-cover/
How to sew an insulated bag or cover to keep a bottle warm or cold. Use it for a baby feeding bottle, juice bottle or your water bottle.
Full pattern and photo step by step instructions at https://so-sew-easy.com/insulated-baby-bottle-cover/