Town Meeting members this week will begin tackling a long list of proposals that could change the way residents buy water, get fuel for their cars, and clean their yards. The annual session will kick off Monday at 8 p.m. in Town Hall, where Special Town Meeting will open Wednesday at 8 p.m. In addition to determining the budget for next fiscal year, the annual meeting will consider more than 50 articles, including a proposed moratorium that would prevent any medical marijuana dispensaries from opening in Arlington until the spring of 2014. Another proposal would end a prohibition against self-service gasoline stations that dates to 1975. The Special Town Meeting warrant includes a proposal by three Arlington High School students to ban the sale of water in single-serving plastic bottles in local stores except in the event of an emergency. Members will also consider an article that would soften a seasonal ban on gas-powered leaf blowers that was approved last spring.