We use refillable bottles for water when traveling. You can take an empty bottle through security and then fill it at a drinking fountain to use while waiting or on the plane.
At home we use glasses with our filtered water instead of bottled water, saving on plastic bottles.
Boiling water for pasta or corn on the cob? When finished, put the lid on the pot until the water is cool. Then use to water plants instead of pouring down the drain.
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