Southwest Emergency Services, which is based on the Shelbourne Road campus of Arbutus United Methodist, provides some.
The food pantry at the nearby St. Clement's Catholic Church shares its resources.
"We all work together," Cain said.
Turkeys are donated.
Some come from Christ the Solid Rock Baptist Church, which buys the turkeys for holiday meal as well as for other church suppers throughout the year.
"They know our church will provide whatever they need," said Jackie Jones, a member of the church on Hammonds Ferry Road.
Jones, owner of the Corner Florist in Lansdowne, and her husband, Fred, help with deliveries.
They said their "mission-minded church" supports a number of ministries in the community.
"We do whatever we can," she said.
Bread comes from a nearby bakery that would otherwise throw it away.
Produce collected all through the summer was blanched and frozen so it would be available through the winter.
Potatoes come from the Society of St. Andrew, a program that collects potatoes rejected by commercial markets and food processors.
Some things they buy. Pies, pumpkin and maybe sweet potato, come from Costco.
"I can't bake them for $5.99," Cain said.
The usual kitchen volunteers will spend Tuesday in the church kitchen cooking turkeys, Cain said.
As with any Thanksgiving feast, timing is everything. Vegetables are prepared for cooking and turkey is sliced on Wednesday. Mashed potatoes and the gravy are the only items on the menu made fresh on Thanksgiving morning.
The crew will arrive by 8 a.m. so dinner's ready when the first guests arrive three hours later. Enough volunteers come to serve that the kitchen crew can take a break during the actual dinner.
Cain said she counts on helpers from Catonsville United Methodist Church every year.
"Whoever shows up, I put them to work," she said.
That includes Jackie Waldman, who heads the church's outreach efforts, and her husband Doug, a trustee.
"Whatever anybody needs me to do, I do," Jackie Waldman said.
After all that cooking and serving, the volunteers will gather with their own families to share Thanksgiving at the church dinner or later.
"My whole family comes and eats," said Cain, who hosts another family gathering at her house the following Sunday for a family Thanksgiving.
In Arbutus, the church's dinner has become Groszer's family Thanksgiving dinner, too.
They get together at the end of the day for coffee and pie and make plans for a weekend get-together, he said.