Reducing the ammount of plastic my family and I use!!!!!!!!

I dont think my family is very conservative when it comes to using plastic. This is because we always by bottles of drinks when we go out, by bottles of water to take on our boat and we use plastic bags at the shop. A way we could save plastic would be to take a drink bottle when we go out rather than by plastic bottles all of the time. Do the same when we go out on our boat and take reusable bags or bilums to the shop so we dont get lots of plastic bags.