Visit your local DSHS office and see what they have for you. (Department of Social and Health Services)
Get on as many lists as you can for shelters, etc. You never know what might open up first.
Look up LNT- Leave No Trace.
Take trash to gas stations, car washes, laundry mats. Can ask a friend if you can use their trash can. Ask your church
Be mindful of any and all Honey Bucket toilets in your area.
Get a portable toilet. Use with leak proof trash can liners and pelletized animal bedding. Throw out in trash cans.
Find showers in your area. Some YMCA have free shower programs. Other places might also. Tacoma WA has traveling showers/laundry trailer. Get their schedule.
Read thread... viewforum.php?f=152 Preparing for being homeless. See if you can upgrade your situation.