In the United Kingdom, 73 student unions, 102 businesses, 30 faith groups, 20 health groups, 33 consumer groups, 18 local authorities, 12 trade unions, education groups, 31 MPs, and many celebrities support the Nestle boycott
Then
the members of those student unions, faith groups, health groups, consumer groups, educations groups, and trade unions;
the councillors who are members of those local authorities;
the owners of those businesses;
and those MPs and celebrities, whoever they may be;
are free as individuals not to buy Nestle formula or chocolate or coffee or whatever.
They are not free to put pressure on others to do so, especially (in the case of the local authorities and businesses) their employees.
In fact no employer has any business asking any employee whether s/he takes part in any such boycott - or wants to.