I do that all the time. I drink countless amounts of water to self soothe. Hey, at least it's not achohol. I rememer being thiristy all the time as a child and I was always getting in trouble at school for taking too long at the drinking fountains or for drinking out of my water bottle the wrong way. My mom took me to the doctor to be tested for diabetes at least umteen times and they always came back negetive. I once came across an article on her about how autistic people need more water than most people because of the stimming and stress. I'll see if I can dig it up.
I can relate on the drinking a single bottle in no time. I can drink one in one sitting. Whenever my neice sees me drinking something she'll chant, "Chug it! Chug it!" and I ablige. She's never unimpressed. Her father (my brother) says I would win a beer chugging contest hands down. But I don't know. I discovered in third grade I can sallow with my mouth open. I can never feel "unthiristy" and panic if I don't have easy acess to water. I cannot sallow if it is above a certian temperature. I keep a container in the refrigerator all time time to keep it ice cold.
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I'm not weird, you're just too normal.